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- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Apr. 18, 1939
- SuDoc number:
- C 21.5/a 2:501/3
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Apr. 11, 1939
- SuDoc number:
- C 21.5/a 2:501/2
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Apr. 4, 1939
- SuDoc number:
- C 21.5/a 2:501/1
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Mar. 28, 1939
- SuDoc number:
- C 21.5/a 2:500/4
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Mar. 21, 1939
- SuDoc number:
- C 21.5/a 2:500/3
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Mar. 14, 1939
- SuDoc number:
- C 21.5/a 2:500/2
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Mar. 7, 1939
- SuDoc number:
- C 21.5/a 2:500/1
- Corporate/Agency Authors:
- Patent Office
- Publisher:
- Patent Office
- Date:
- Feb. 28, 1939
- SuDoc number:
- C 21.5/a 2:499/4
- Corporate/Agency Authors:
- Patent Office
- Publisher:
- Patent Office
- Date:
- Feb. 21, 1939
- SuDoc number:
- C 21.5/a 2:499/3
- Corporate/Agency Authors:
- Patent Office
- Publisher:
- Patent Office
- Date:
- Feb. 14, 1939
- SuDoc number:
- C 21.5/a 2:499/2