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- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- May 31, 1938
- SuDoc number:
- C 21.5/a 2:490/5
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- May 24, 1938
- SuDoc number:
- C 21.5/a 2:490/4
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- May 17, 1938
- SuDoc number:
- C 21.5/a 2:490/3
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- May 10, 1938
- SuDoc number:
- C 21.5/a 2:490/2
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- May 3, 1938
- SuDoc number:
- C 21.5/a 2:490/1
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Apr. 26, 1938
- SuDoc number:
- C 21.5/a 2:489/4
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Apr. 19, 1938
- SuDoc number:
- C 21.5/a 2:489/3
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Apr. 12, 1938
- SuDoc number:
- C 21.5/a 2:489/2
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Apr. 5, 1938
- SuDoc number:
- C 21.5/a 2:489/1
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Mar. 29, 1938
- SuDoc number:
- C 21.5/a 2:488/5