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- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Revised Sept. 1, 1926 [10th revised edition]. 1926
- SuDoc number:
- C 21.7/2:926
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Revised Nov. 1, 1925 [9th revised edition]. 1925
- SuDoc number:
- C 21.7/2:925