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Creation Date 

1. Before 1966  (22)
2. 1966 To 1982  (41)
3. 1983 To 1996  (85)
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5. After 2009  (5,092)
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Subject 

1. Physics  (2,954)
2. Fixed Constructions  (2,481)
3. Construction Of Roads, Railways, Or Bridges  (2,292)
4. Transporting  (1,988)
5. Performing Operations  (1,988)
6. Signalling  (1,882)
7. Traffic Control Systems  (1,835)
8. Vehicles In General  (1,605)
9. Conjoint Control Of Vehicle Sub-Units Of Different Type Ordifferent Function  (1,302)
10. Control Systems Specially Adapted For Hybrid Vehicles  (1,302)
11. Road Vehicle Drive Control Systems For Purposes Not Related Tothe Control Of A Particular Sub-Unit  (1,302)
12. Electricity  (1,006)
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16. Measuring  (817)
17. Testing  (817)
18. Electric Communication Technique  (796)
19. Machines Or Auxiliary Tools For Construction Or Repair  (766)
20. Construction Of, Or Surfaces For, Roads, Sports Grounds, Orthe Like  (766)
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Language 

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2. Chinese  (2,168)
3. French  (1,146)
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