Refine My Results

Creation Date 

1. Before 1960  (3,582)
2. 1960 To 1975  (5,189)
3. 1976 To 1991  (23,439)
4. 1992 To 2008  (113,391)
5. After 2008  (357,826)
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New Records 

1. New From Last Week  (298)
2. New From Last Month  (12,322)
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Subject 

1. Physics  (242,388)
2. Electricity  (156,552)
3. Lighting  (136,656)
4. Weapons  (136,656)
5. Blasting  (136,656)
6. Heating  (136,656)
7. Mechanical Engineering  (136,656)
8. Structural Combinations Of Lighting Devices With Otherarticles, Not Otherwise Provided For  (108,423)
9. Functional Features Or Details Of Lighting Devices Or Systemsthereof  (108,423)
10. Optics  (83,593)
11. Human Necessities  (82,352)
12. Measuring  (74,859)
13. Testing  (74,859)
14. Optical Elements, Systems, Or Apparatus  (70,858)
15. Systems Thereof  (65,401)
16. Non-Portable Lighting Devices  (65,401)
17. Vehicle Lighting Devices Specially Adapted For Vehicleexteriors  (65,401)
18. Transporting  (57,227)
19. Performing Operations  (57,227)
20. Basic Electric Elements  (55,878)
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Language 

1. English  (455,538)
2. Chinese  (166,747)
3. French  (73,516)
4. German  (52,143)
5. Japanese  (29,719)
6. Korean  (19,148)
7. Spanish  (3,757)
8. Russian  (3,587)
9. Portuguese  (1,418)
10. Italian  (885)
11. Hebrew  (875)
12. Danish  (520)
13. Swedish  (418)
14. Polish  (405)
15. Dutch  (390)
16. Finnish  (272)
17. Norwegian  (256)
18. Romanian  (170)
19. Ukrainian  (169)
20. Czech  (119)
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