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Creation Date 

1. Before 1920  (962)
2. 1920 To 1949  (3,411)
3. 1950 To 1952  (1,747)
4. 1953 To 1956  (939)
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New Records 

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Subject 

1. Chemistry  (1,301)
2. Metallurgy  (1,301)
3. Transporting  (1,145)
4. Performing Operations  (1,145)
5. Flexible Materials Not Otherwise Provided For  (1,007)
6. Treatment Of Textiles Or The Like  (1,007)
7. Laundering  (1,007)
8. Technical Subjects Covered By Former Uspc Cross-Reference Art Collections [xracs] And Digests  (937)
9. General Tagging Of Cross-Sectional Technologies Spanning Over Several Sections Of The Ipc  (937)
10. General Tagging Of New Technological Developments  (937)
11. Technical Subjects Covered By Former Uspc  (910)
12. Technical Subjects Covered By Former Us Classification  (746)
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Language 

1. English  (5,206)
2. French  (1,438)
3. German  (1,283)
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5. Spanish  (23)
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