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Creation Date 

1. Before 1978  (1)
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1. Textiles  (29)
2. Production Of Cellulose  (26)
3. Paper-Making  (26)
4. Chemistry  (24)
5. Metallurgy  (24)
6. Paper Not Otherwise Provided For  (20)
7. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (20)
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