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Creation Date 

1. Before 2011  (2)
2. 2011 To 2014  (3)
3. 2015 To 2017  (3)
4. 2018 To 2022  (4)
5. After 2022  (1)
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Subject 

1. Chemistry  (6)
2. Metallurgy  (6)
3. Electricity  (6)
4. Organic Chemistry  (5)
5. Heterocyclic Compounds  (3)
6. Manufacture Of Assemblages Of Electrical Components  (2)
7. Printed Circuits  (2)
8. Performing Operations  (2)
9. Semiconductor Devices  (2)
10. Boards, Substations, Or Switching Arrangements For The Supplyor Distribution Of Electric Power  (2)
11. Casings Or Constructional Details Of Electric Apparatus  (2)
12. Compositions Based Thereon  (2)
13. Their Preparation Or Chemical Working-Up  (2)
14. Conversion Or Distribution Of Electric Power  (2)
15. Basic Electric Elements  (2)
16. Electric Techniques Not Otherwise Provided For  (2)
17. Organic Macromolecular Compounds  (2)
18. Generation  (2)
19. Macromolecular Compounds Obtained By Reactions Only Involvingcarbon-To-Carbon Unsaturated Bonds  (2)
20. Electric Solid State Devices Not Otherwise Provided For  (2)
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Language 

1. Chinese  (6)
2. French  (2)
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