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- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- July 12, 1938
- SuDoc number:
- C 21.5/a 2:492/2
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- July 5, 1938
- SuDoc number:
- C 21.5/a 2:492/1
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- Revised July 1, 1938. 1938
- SuDoc number:
- C 21.7/1:938
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- June 28, 1938
- SuDoc number:
- C 21.5/a 2:491/4
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- June 21, 1938
- SuDoc number:
- C 21.5/a 2:491/3
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- June 14, 1938
- SuDoc number:
- C 21.5/a 2:491/2
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- June 7, 1938
- SuDoc number:
- C 21.5/a 2:491/1
- 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