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Creation Date 

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Subject 

1. Transporting  (45)
2. Performing Operations  (45)
3. Chemistry  (31)
4. Metallurgy  (31)
5. Lining Machines  (30)
6. Stamps  (30)
7. I.E. Mechanisms Printing Otherwise Than From A Forme  (30)
8. Correction Of Typographical Errors  (30)
9. Selective Printing Mechanisms  (30)
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12. Treatment Of Water, Waste Water, Sewage, Or Sludge  (27)
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17. Heating  (14)
18. Mechanical Engineering  (14)
19. General Tagging Of Cross-Sectional Technologies Spanning Over Several Sections Of The Ipc  (13)
20. General Tagging Of New Technological Developments  (13)
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Databases 

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