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Creation Date 

1. Before 1979  (85)
2. 1979 To 1987  (67)
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Subject 

1. Transporting  (72)
2. Performing Operations  (72)
3. Chemistry  (52)
4. Metallurgy  (52)
5. Physical Or Chemical Processes Or Apparatus In General  (45)
6. Technical Subjects Covered By Former Uspc Cross-Reference Art Collections [xracs] And Digests  (39)
7. General Tagging Of Cross-Sectional Technologies Spanning Over Several Sections Of The Ipc  (39)
8. General Tagging Of New Technological Developments  (39)
9. Separation  (36)
10. Technologies Or Applications For Mitigation Or Adaptation Againstclimate Change  (30)
11. Air  (26)
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