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Franklin M. Dietz received US Patent No. 1,811,385 on June 23, 1931, filed September 7, 1929. It was assigned to Johns Manville.
- Author
- Franklin M. Dietz
- Published by
- US Patent Office
- Series
- US Patent No. 1,811,385
- Date
- June 23, 1931
- Library no.
- ACL Doc 21643 · asbestosclaims.law/library/21643
- Rights
- US government work, in the public domain.
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Where it was listed
- Asbestos, September 1931, in its patents department (the year's issues)
Cite this document
Franklin M. Dietz. “Acoustical Board (US Patent 1,811,385, 1931).” June 23, 1931. US Patent No. 1,811,385. US Patent Office. AsbestosClaims.Law Library, ACL Doc 21643. https://asbestosclaims.law/library/21643.
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