HomeSupplier Discoveryarrow-rightManufacturing & Processing Machineryarrow-rightMineral Separatorarrow-rightEfficient Spiral Classifier Factories & Companies
Filter
Category
More
Management Certification
More
R&D Capacity
Annual Revenue
No.of Employees
Province & Region
More
about efficient spiral classifier
  • Technological Innovation
  • Reliable Supply Chains
  • Substantial Manufacturing Capabilities

efficient spiral classifier100+ factories verified

Jinhao Mining Machinery

Main Products:
Mining Equipment, Mining Machine, Gold Mining Machine, Lithium Ore Mining Machine, Copper Ore Mining Machine, Iron Ore Mining Machine, Nickel Ore Mining Machine, Lead and Zinc Mining Machine, Quartz Sand Ore Mining Machine, Graphite Ore Mining Machine
Country/Region:
Beijing, China
Company Profile:
Yantai Jinhao Mining Machinery Co., Ltd. is located in Zhaoyuan City, the beautiful Gold Capital in China. The company's principal activities are to manufacture machines for nonferrous metals and non - metallic ore - dressing and smelting process. The company covers an area of 45, 000 square meters with 18, 000 square meters of modern manufacturing workshop and more than 30 large - scale processing equipments. The company has excellent professional and technical staff, strong technical force, complete processing equipment and perfect detection means. Not only provide customers high - quality production equipment, but also provide customers full range services of ore dressing, smelting, production line design, installation debugging, technical guidance, personnel training with a complete and comprehensive program.

Henan Xingyang Mining Machinery Manufactory

29 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Ball Mill, Rotary Dryer, Rotary Kiln, Jaw Crusher, Impact Crusher, Magnetic Separator, Flotation Machine, Spiral Chute, Shaking Table, Vibrating Screen
Country/Region:
Henan, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Henan Xingyang Mining Machinery Manufactory(XKJ GROUP) used to be a state-own company, located in the center of China Henan Zhengzhou, where occupied the important railway, highways, electric power, and postal communications and is the significant economical center in the new Eurasian Land Bridge. And at the same time, it has the advantage of central city of the central plain economic zone, developed science and technology, solid industrial foundation, policy superiority and perfect foundation facilities.

YANTAI JINHAO MINING MACHINERY CO.,LTD

22 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Mining Machine, Mining Equipment, Gold Mining Machine, Lithium Ore Mining Machine, Copper Ore Mining Machine, Iron Ore Mining Machine, beneficiation machine, cyanidation machine, CIL, CIP, ball mill
Country/Region:
Shandong, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Yantai Jinhao Mining Machinery Co., Ltd. is located in Zhaoyuan City, the beautiful Gold Capital in China.

Shanghai Fortune Group Corporation

Main Products:
Continuous Casting Machine, Rolling Machine, Upward Casting Machine, Industrial Furnace, CNC Machine, Conforming Machine, Drawing Machine
Country/Region:
Shanghai, China
Sample Service:
Sample Available
Company Profile:
Fortune Group is a leading international turnkey project contractor specializing in the nonferrous metals industry, located in Shanghai China. As anintegrated one-stop service provider, we deliver end-to-end solutions encompassing raw material supply, mining, smelting and casting equipment R&D copper/ aluminum process inginnovation, equipment supply and finished product technical services. Our closed-loop service approach ensures seamless execution for your project from raw materials to final production.

Henan Fantianliang Machinery & Equipment Co., Ltd.

Main Products:
Crusher, Mining Equipment, Ball Mill, Gold CIP Plant, Gold Cil Plant, Copper Flotation Plant, Mineral Process Plant, Flotation Machine, Gold Recovery Plant, Gold Process Production Line
Country/Region:
Henan, China
Company Profile:
We are a manufacturer specialize in building material Equipment, stone crushing plant, cement plant, AAC block plant, ore mining Equipment, etc. Which is founded in 2008 by restructuring. The first company was established in 1978. Now, We integrate the research, development, production, and sale together. Our company is located in Zhengzhou City which is a transportation junction city of China. After 40 years' development, our company has already owed 3 branch companies and 1 machinery research institute. Our company covers an area of 50, 000 square meters, including 15, 000 square meters of modern buildings. We have adopted the scientific management mode of modern enterprises, and constantly strive to create novel products. As a result, our company has become a famous enterprise of machinery industry in China. With many years' development, we have accumulated rich experience in the production and management, and brought up a large number of technical members and management elites. Nowadays, we have 660 employees, including 180 senior and intermediate technical members. Our company has 100 sets of various large and medium Equipment and several workshops for casting, forging, thermal treatment, machinery processing, welding, assembly, and machine repair. Our company has passed the evaluation of ISO9001.2015 certification.

Jiangxi Hengchang Mining Machinery Manufacturing Co., Ltd.

21 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Jaw Crusher, Ball Mill, Shaking Table, Feeding Equipment, Classifing Equipment, Flotation Equipment, Magnetic Separator, Conveyor, Drying Equipment, Gravity Separation Equipment
Country/Region:
Jiangxi, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Jiangxi Hengchang Mining Machinery Manufacturing Co., Ltd. is located in No. 3 Chuangye Road, Industrial Park, Shicheng County, Ganzhou City, Jiangxi Province, China. Our company is engaged in providing the complete mineral processing equipment research, development, design and production from1985 years, So we have accumulated rich experience in design and production.

Zhengzhou Zhongjia Heavy Industry Co., Ltd.

10 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Flotation Cell, Ball Mill, Jaw Crusher, Hammer Mill Crusher, Roller Crusher, Cone Crusher, Rotary Kiln, Vibration Screen, Sand Washer, Spiral Classifier
Country/Region:
Henan, China
Company Profile:
Zhengzhou Zhongjia Heavy Industry Co., Ltd. is located in Xingyang City, west of Zhengzhou City, Henan Province. With several years of development, the company has grown up to one of the heavy machinery manufacturing enterprises of mine machinery, building materials machinery, metallurgy machinery, chemical machinery and environmental protection machinery, with design department, research department, Sales and installation department.

Nanjing Lanjiang Pump Industry Co., Ltd.

13 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Submersible mixer, Aerator, Screen machine, Pumps, Sludge scraper & suction machine, Solid separator
Country/Region:
Jiangsu, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Nanjing Lanjiang Pump Industry Co., Ltd. is committed to the design and development of sewage treatment equipment, production, sales and integration of professional manufacturers. The company is located in the northern suburbs of Nanjing, Ningtong Expressway, scenic Liuhe District, No. 18 Xinyu Road. Company leading products are: Mixing series: QJB submersible mixer, FQJB type float mixer. Submersible thruster. Vertical circulating mixer. Hyperboloid mixer. Paddle type (frame type) mixer. Diving aeration series: Jet aerator, centrifugal aerator, QFB float aerator. Float mixing aerator, deep-water aerator. Trash conveyor series: Mechanical grilles, shaftless screw conveyor, screw press, grit tank sand remover, sand water separator. Scraper suction machine series: Peripheral drive, central drive, vehicle type, siphon type scraper suction machine, decanter, gate, buried sewage treatment equipment. Submersible pump series: AS, AV, WQ, AF submersible sewage pump, QJB-W sludge reflux pump, ZQB, HQB submersible shaft, mixed flow pump, RJC long shaft deep well pump, QRJ well submersible pump and other sewage treatment equipment. Has rich production experience and technology in fluid treatment system. Products are widely used in water environmental protection, monitoring, sewage treatment, petrochemical, municipal water supply and drainage and infrastructure projects and water conservancy, power stations and agricultural irrigation projects.

Henan Hengtailong Machinery Co., Ltd

8 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Mining Equipments, Minerals Processing Equipments, Crushing Machine, Ore/Coal Washing Machine, Drying Machine, Sand Making Machine, Briquettes Machine, Ball Mill, Jaw Crusher, Flotation Machine
Country/Region:
Henan, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Henan Hengtailong Machinery Co., Ltd. is Established in 1992, a professional manufacturer of complete set mineral beneficiation equipments from crushing to ore concentrator,   Briquette equipments, carbonization/ activated carbon equipment, Drying euipment, Environmental protection equipments, products widely used in mineral processing, metallurgy, building materials, chemicals, electricity, petroleum, coal, transportation, fertilizer, gas industry etc.

ALICOCO MINERAL TECHNOLOGY CO., LTD.

21 yrs
·Trading Company
Main Products:
Spiral Separator, Spiral Concentrator, Wet Table, Shaking Table
Country/Region:
Guangdong, China
R&D Capacity:
ODM Service
Company Profile:
We are The Manufacturer of the Gravity Spiral Concentrator, The ALICOCO's 1200H series plastic Spiral Concentrator (Spiral Separator) is one of the most effective of gravity dressing equipment. The component is make of PVC (polymers of vinyl chloride) plastic material, that is lightweight, low-cost, lightfast, fastness to unshape, agingfast, acid/alkali fastness, un-crispness, flame-resistant, and good fastness to wear. The quality state is excellence.

Jiangxi Longzn Machinery Co., Ltd.

Main Products:
Mineral Processing Plant, Alluvial Gold Washing Plant, Mineral Washing Equipment, Crushing & Grinding Equipment, Screening & Classifying Equipment, Gravity Separation Equipment, Flotation Separation Equipment, Magnetic Separation Equipment, Electric Separator, Feeding & Conveying Equipment
Country/Region:
Jiangxi, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Jiangxi Longzn Machinery Co., Ltd.: Your Trusted Partner in Gravity Mining Solutions

ATAIRAC ENGINEERED PRODUCTS INC(CHINA)

13 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Vibrating Feeder; Jaw Crusher; Impact Crusher; Cone Crusher; Vertical Shaft Impact Crusher; Vibrating Screen; Belt Conveyor; Mills; Mobile Crusher
Country/Region:
Shanghai, China
R&D Capacity:
ODM Service
Company Profile:
ATAIRAC China is the top3 of mining equipment in China. Our products include feeder, jaw crusher, impact crusher, cone crusher, sand making machine, vibrating screen, sand washing machine, spiral classifier, fine sand recycling device, belt conveyor and other mineral production line assistant equipments.

Ganzhou Gelin Mining Machinery Co., Ltd.

15 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Trommel Screen, Rotary Scrubber, Shaking Table, Jig Machine, Gold Washing Machine, Flotation Cell, Wet Pan Mill, Sand Washing Machine, Ball Mill, Jaw Crusher, Hammer Crusher, Spiral Separator, Magnetic Separator, High Tension Electrostatic Separator, Gravity Centrifugal Concentrator, Zircon Sand Processing Machine
Country/Region:
Jiangxi, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Ganzhou Gelin Mining Machinery Company Limited is an expert manufacturing mining machines in China. Our company is located in the Industrial Zone of Shicheng County, Jiangxi Province.

Henan Songling Heavy Industry Technology Co., Ltd.

Main Products:
Mining Machine, Crushers, Grinding Mills, Feeders, Screens, Flotation Machine, Magnetic Separator, Oil Sludge Pyrolysis Machine, Ore Dressing Equipments, Conveyors
Country/Region:
Henan, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Henan Songling Heavy Industry Technology Co., Ltd. is located in Zhengzhou city in central plains, which adjoins to ancient millennium Shaolin Temple (Kung fu Origin) to the south, and Yellow River to the north. With Kailuo highway and Longhai railway, it owns convenient transportation and pleasant scenery.

Shandong Wanze Shengshi Environmental Protection Technology Co., Ltd

Main Products:
Sewage Treatment Equipment, Diesel Generator Sets Gas Generator Sets, Industrial Water Pumps, Export of Machinery and Equipment
Country/Region:
Shandong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Shandong Wanzheshengshi Environmental Protection Technology Co., Ltd. Was established in 2018 and is situated in Weifang, a city renowned as the "Kite Capital. " The company is dedicated to the research and development of environmental protection technologies, the general contracting of wastewater treatment projects, and equipment supply; Furthermore, it specializes in the construction of environmental engineering projects and equipment maintenance services. We provide comprehensive and integrated solutions, each meticulously tailored to the specific wastewater discharge conditions of our clients. The company's core product portfolio encompasses a wide range of wastewater treatment equipment, including sanitary wastewater treatment systems, electrolytic treatment systems, and rural domestic sewage treatment facilities. Additionally, the company holds independent import and export rights, through which we are committed to providing global clients with high-quality export services for Chinese-manufactured machinery and electromechanical equipment. "Empower your projects with reliable Chinese equipment-from wastewater treatment solutions to generator sets and various industrial machinery, find it all with this trusted partner.

Shicheng Oasis Mineral Equipment Manufacturing Co., Ltd.

16 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Shaking Table, Crushers, Ball Mill, Magnetic Separator, Vibrating Screen, Flotation Cell, Drum Washing Machine
Country/Region:
Jiangxi, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Shicheng Oasis Mineral Equipment Manufacturing Co., Ltd. is an import-export trade enterprise engaged in the production, sale and installation of mineral equipment, environmental protection equipment, hardware and machinery. Our company has been approved for registration by relevant departments, and can provide users with project design, process design and uniform and non-uniform design services.

Toptic Tech (Zhongshan) Co.,Ltd.

Main Products:
Metal Detector, X-ray Inspection System, Inclined Conveyor, Vision Inspection System, Weight Sorting Machine, Check Weigher, Bowl-Type Elevator, Z-Type Bucket Elevator, Bowl Hopper Conveyor, Screw Conveyor
Country/Region:
Guangdong, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Toptic Tech (Zhongshan) Co., Ltd. is a high-tech enterprise integrating R& D, design, manufacturing and sales. The main products are X Ray inspection system, Optical sorting machine, Metal detector and related service.

Qingdao SWDF Trading Co., Ltd.

Main Products:
Mining Machine, Crusher Feeder Screener or Sieve, Iron Remover Metal Detector, Dust Collector, Filter Grinder, Packing Machine, Magnetic Magnet, Conveyor Spart Parts, Mixer Motor Excavator, Transportation Forklift
Country/Region:
Shandong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Qingdao SWDF Trading Co., Ltd. is a mining machinery factory subsidiary trading company, located in the heavy machinery city of Qingdao, Shandong. Products are widely used in Metallurgy, Mining, Electric power, Cement, Brick, Coal, Paper, Food, Chemical, Building materials, Glass and other industries.

Shandong Yunfan Heavy Industry Group Co., Ltd

4 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Drum Dryer
Country/Region:
Shandong, China
R&D Capacity:
ODM Service
Company Profile:
Shandong Yunfan Heavy Industry Group Co., Ltd. Was established in 2015 with a registered capital of 20 million. It has passed the national high-tech enterprise certification and specializes in the research and development of drum drying production lines. The company has advanced mechanical processing and manufacturing technology and perfect product quality testing methods. It always adheres to the market-oriented approach and actively cooperates with many domestic scientific research institutes. There are currently 8 senior engineers and 2 professors and senior engineers. Implement the independent innovation strategy to create a scientific and technological innovation enterprise.

Jiangsu Leizhan International Trade Co., Ltd.

Main Products:
Paper Machinery, Paper Machine Felt, Paper Machine Forming Wire, Screen Basket, Pulper, Dryer, Cylinder, Refiner, Pressure Screen, Dryer Cylinder
Country/Region:
Jiangsu, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
We are a China industrial felt & fabric manufacturer and paper machinery engineer company located in Jiangsu province, Xuzhou city. We committed to offering the best quality products, the most favorable price, free consultation, and complete solutions related to the paper-making industry, filter press, transportation, and pavement construction industry. For years, we have insisted on taking customer's requirements as our center and having strict quality control and innovation in the whole process.

Jiangxi Henghong International Mining Machinery Co., Ltd.

11 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Mining Machine, Feeding/Crushing/Screening/Grinding/Classifying Equipment, Agitation Equipment, Flotation Equipment, Gravity Separation Equipment, Magnetic Separtaor Equipment, Belt Conveyor Equipment
Country/Region:
Jiangxi, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Jiangxi Henghong International Mining Machinery Co., Ltd is the leading company which specialized in designing & manufacturing of gold mining equipment with more than 30 years experience in China. Up to now, we have developed some major product lines, they are mining crushing machine, mining grinding machine, mining classifying separator, mining flotation machine and the mining gravity separator etc. We have three senior engineers and two junior engineers on equipment designing and mining process designing. At the same time, we kept good relationship with some mining research institute and university, such as Jiangxi University of Science and Technology, Ganzhou Nonferrous Metallurgy Research Institute, Hunan Research Institute of Nonferrous Metals, and etc., to improve our designing and production, and also provide technology support for the mining project. We have accumulated enough experience in gold mining plant, tungsten mining plant, wolfram mining plant, tin mining plant, cassiterite mining plant, coltan mining plant, columibte mining plant, iron ore mining plant, black/beach sand mining plant designing, manufacturing, installing, commissioning and training. We could provide the customized complete mining solution to our customer. Our major overseas market is Africa and Southeast Asia, and our products covers 43 global countries, as more and more customers are aware of our quality products and good service, this number is growing fast. Main products: Ball mill, wet pan mill, jaw crusher, hammer crusher, hammer mill, vibrating feeder, vibrating screen, trommerl screen, spiral classifier, leaching tank, conveyor belts, flotation machine, gravity seprator, shaking table, spiral chute, jig machine, centrifugal concentrator, gold smelting furnace and other mining equipments. We warmly welcome friends from home and abroad to cooperate with us and create a bright future together.

Henan Zhengzhou Mining Machinery Co., Ltd.

20 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Rotary Kiln, Ball Mill, Disc Granulator, Active Lime Production Line, Cement Production Line, Magnesium Calcined Line, Cement Grinding Plant, LECA Production Line, Rotary Dryer, Conveyor, Bag Filter
Country/Region:
Henan, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Henan Zhengzhou Mining Machinery Co., Ltd, was established in 1956 and located in Xingyang of Zhengzhou City of Henan Province, specially produces metallurgical machinery. It covers an area of more than 55000m2 and various building area of 28000 m2. It has the annual income of more than RMB180million in 2008 and now the fixed assets of over RMB80 million. In the plant, there are branches and workshops of cast iron, cast steel, forging, heavy machine tool processing, rivet welding and heat treatment etc. Its perfect and complete equipment, advanced detection means, strong technical force establish good foundation for the reliable production.

Henan Lychen Machinery Co., Ltd

Main Products:
Trituradora De Piedra, Rompedora, Perforadora, Bomba De Lodos, Molino De Bolas
Country/Region:
Henan, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Henan Lychen Machinery Co., Ltd. is a professional enterprise dedicated to the R&D, manufacturing, sales and service of mineral processing equipment and supporting auxiliary equipment. With years of deep cultivation in the global mining industry, the company has always taken "providing high-quality, reliable and efficient mining solutions" as its core mission, and is committed to becoming a trusted long-term partner for mining enterprises around the world.

Shandong Huimin Lusheng Metal Products Co., LTD

17 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Vibrating Screen, Vibrating Sieve, Sieving Machine, Crushing Machine, Sand Washing Machine, Mining Equipment, Welded Mesh
Country/Region:
Shandong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Shandong Huimin Lusheng Metal Products Co., Ltd. is a leading enterprise specializing in the production of screening equipment, crushers, and other related machinery. As a state-level high-tech company, we are dedicated to the research and development, design, production, and sales of innovative products focused on mineral classification, separation technologies, wear-resistant materials, and more. Our mission is to provide global partners with products that enhance core competitiveness along with comprehensive engineering solutions.

Shandong Luke Automation Technology Co., Ltd.

Main Products:
Mining Machinery
Country/Region:
Shandong, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Rukoo Group (Shanhai Equipment Alliance), established based on the Intelligent Equipment Research Institute of Shandong University of Science and Technology (formerly the Mechanical and Electrical Technology Research Institute of Shandong University of Science and Technology), is a comprehensive intelligent equipment import and export industrial group alliance with the Shandong Rukoo Automation Technology Co., Ltd. As its core. It integrates R&D, production, and trade. The alliance brings together dozens of high-quality units in the industry, and its business covers various fields such as mining equipment, emergency and petroleum equipment, construction machinery equipment, agricultural equipment, livestock breeding equipment, slaughter and processing equipment, food processing equipment, high and low voltage electrical / distribution / charging / energy storage equipment, sports equipment, and building materials and food import and export.

Shandong Snowte Powder Technology Co., Ltd

9 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Pulverizer
Country/Region:
Shandong, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Shandong Snuote Powder Technology Co., Ltd.  is a leading manufacturer of ultrafine grinding, micronizing, and powder-processing systems. Based in Weifang, we integrate R&D, manufacturing, and engineering to deliver high-performance equipment worldwide. Our portfolio includes ultrafine grinders, jet mills, air classifiers, ACM mills, vertical mills, and turnkey powder-processing lines for chemicals, minerals, pharmaceuticals, food, spices, pigments, ceramics, and new materials.

TYXC Environmental Protection Equipment Manufacturing Co., Ltd

8 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Vibrating Screen, Linear Dewatering Screen, Hydrocyclone, Flip-flop Screen, Roll Screen, Box Type Linear Dewatering Screen, Dehydration Recycling Machine, Sand Washer, Fine Sand Recovery Machine
Country/Region:
Sichuan, China
R&D Capacity:
OEM/ODM Service
Company Profile:
TYXC Environmental Protection Equipment Manufacturing Co., Ltd. Was established on November 12, 2018, located at No. 7, South Section of Changping Avenue, North Zone, shifang city Economic Development Zone, Deyang City, Sichuan Province. Since its establishment, the company has always adhered to the tenet of "quality first, customer first" and devoted itself to the research, development, design, production and sales of environmental protection equipment.

ZHENGZHOU ZHENGJIA HEAVY INDUSTRY CO.,LTD.

Main Products:
Ball Mill, Stone Crusher, Cement Ball Mill, Rotary Dryer, Rotary Kiln, Sand Washer, Vibrating Feeder
Country/Region:
Henan, China
R&D Capacity:
OEM Service
Sample Service:
Sample Available
Company Profile:
Zhengzhou ZhengJia Industry Co., Ltd. is a joint-stock mining machinery manufacturing enterprise integrated in scientific research, production and marketing. It is located at the High & New Technology Industries Development Zone of Zhengzhou, China with an area of 50 thousand m² Which includes 15, 000 m² Of standard heavy duty industrial workshop. Equipments are more than 160 pieces, including large and medium sized metal processing, riveting and installing equipments. There are more than 660 workers including 80 administrators with secondary and senior occupational titles and engineering technicians.
15