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Walter E. Knapp received US Patent No. 1,729,167 on September 24, 1929, filed April 3, 1928.
- Author
- Walter E. Knapp
- Published by
- US Patent Office
- Series
- US Patent No. 1,729,167
- Date
- September 24, 1929
- Library no.
- ACL Doc 23773 · asbestosclaims.law/library/23773
- Rights
- US government work, in the public domain.
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Where it was listed
- Asbestos, June 1947, in its patents department (the year's issues)
Cite this document
Walter E. Knapp. “Toothbrush (US Patent 1,729,167, 1929).” September 24, 1929. US Patent No. 1,729,167. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23773. https://asbestosclaims.law/library/23773.
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