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Creation Date 

1. Before 1980  (1)
2. 1980 To 1980  (4)
3. 1981 To 1981  (20)
4. 1982 To 1983  (387)
5. After 1983  (1,649)
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New Records 

1. New From Last 3 Month  (11)
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Subject 

1. Lighting  (1,180)
2. Weapons  (1,180)
3. Blasting  (1,180)
4. Heating  (1,180)
5. Mechanical Engineering  (1,180)
6. Transporting  (807)
7. Performing Operations  (807)
8. Manufacture Or Storage Of Ice  (684)
9. Liquefaction Solidification Of Gases  (684)
10. Refrigeration Or Cooling  (684)
11. Combined Heating And Refrigeration Systems  (684)
12. Heat Pump Systems  (684)
13. Machine Tools  (604)
14. Metal-Working Not Otherwise Provided For  (604)
15. Working By Laser Beam  (588)
16. Soldering Or Unsoldering  (588)
17. Welding  (588)
18. Cutting By Applying Heat Locally, E.G. Flame Cutting  (588)
19. Cladding Or Plating By Soldering Or Welding  (588)
20. Chemistry  (420)
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