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G. D. Crabbs received US Patent No. 1,689,278 on October 30, 1928.
- Author
- G. D. Crabbs
- Published by
- US Patent Office
- Series
- US Patent No. 1,689,278
- Date
- October 30, 1928
- Library no.
- ACL Doc 23523 · asbestosclaims.law/library/23523
- Rights
- US government work, in the public domain.
Read or download
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Where it was listed
- Asbestos, January 1929, in its patents department (the year's issues)
Cite this document
G. D. Crabbs. “Railroad Crossing (US Patent 1,689,278, 1928).” October 30, 1928. US Patent No. 1,689,278. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23523. https://asbestosclaims.law/library/23523.
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