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Christian Gottwald received US Patent No. 2,133,731 on October 18, 1938, filed June 26, 1936. It was assigned to Ric Wil Co.
- Author
- Christian Gottwald
- Published by
- US Patent Office
- Series
- US Patent No. 2,133,731
- Date
- October 18, 1938
- Library no.
- ACL Doc 22137 · asbestosclaims.law/library/22137
- Rights
- US government work, in the public domain.
Read or download
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Where it was listed
- Asbestos, January 1939, in its patents department (the year's issues)
Cite this document
Christian Gottwald. “Conduit (US Patent 2,133,731, 1938).” October 18, 1938. US Patent No. 2,133,731. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22137. https://asbestosclaims.law/library/22137.
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