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Walter E. Knapp received US Patent No. 1,729,168 on September 24, 1929, filed April 3, 1928.
The patent's description opens (from the scanned text):
The present invention relates to tooth brushes, and more particularly to tooth brushes, the tooth-engaging surface of which may be purified by fire or by boiling water.
- Author
- Walter E. Knapp
- Published by
- US Patent Office
- Series
- US Patent No. 1,729,168
- Date
- September 24, 1929
- Library no.
- ACL Doc 23774 · asbestosclaims.law/library/23774
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 3 pages · 230 KB
Where it was listed
- Asbestos, June 1947, in its patents department (the year's issues)
Cite this document
Walter E. Knapp. “Toothbrush (US Patent 1,729,168, 1929).” September 24, 1929. US Patent No. 1,729,168. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23774. https://asbestosclaims.law/library/23774.
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