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- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- [1934.]
- SuDoc number:
- C 21.8/a:At 85/934
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- [1927.]
- SuDoc number:
- C 21.8/a:At 85/2
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- [Reprint with additions 1925.]
- SuDoc number:
- C 21.8/a:At 85