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Harold W. Langbein received US Patent No. 1,801,927 on April 21, 1931, filed December 5, 1925.
- Author
- Harold W. Langbein
- Published by
- US Patent Office
- Series
- US Patent No. 1,801,927
- Date
- April 21, 1931
- Library no.
- ACL Doc 21952 · asbestosclaims.law/library/21952
- Rights
- US government work, in the public domain.
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Where it was listed
- Asbestos, August 1931, in its patents department (the year's issues)
Cite this document
Harold W. Langbein. “Brake Testing Machine (US Patent 1,801,927, 1931).” April 21, 1931. US Patent No. 1,801,927. US Patent Office. AsbestosClaims.Law Library, ACL Doc 21952. https://asbestosclaims.law/library/21952.
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