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- chemical engineering (3)
- electronics (3)
- solid state electronics (3)
- computers (2)
- electric engineering (2)
- electronic apparatus and appliances (2)
- electronic data processing (2)
- engineering (2)
- environmental engineering (2)
- information storage and retrieval systems (2)
- adhesives (1)
- automation (1)
- chemistry, technical (1)
- corrosion and anti-corrosives (1)
- electric controllers (1)
- electric power (1)
- electrochemistry (1)
- electrochemistry, industrial (1)
- engineering design (1)
- environmental policy (1)
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