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Creation Date 

1. Before 1999  (804)
2. 1999 To 2004  (147)
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5. After 2017  (790)
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New Records 

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Subject 

1. Electricity  (908)
2. Basic Electric Elements  (451)
3. Conversion Or Distribution Of Electric Power  (319)
4. Generation  (319)
5. Investigating Or Analysing Materials By Determining Theirchemical Or Physical Properties  (256)
6. Emergency Protective Circuit Arrangements  (145)
7. Magnets  (136)
8. Inductances  (136)
9. Transformers  (136)
10. Selection Of Materials For Their Magnetic Properties  (136)
11. Basic Electronic Circuitry  (113)
12. Processes Or Means, E.G. Batteries, For The Direct Conversionof Chemical Into Electrical Energy  (108)
13. Human Necessities  (99)
14. Electric Communication Technique  (99)
15. Circuit Arrangements Or Systems For Supplying Or Distributingelectric Power  (93)
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