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William Alfred Porter received US Patent No. 2,193,040 on March 12, 1940, filed October 11, 1937.
- Author
- William Alfred Porter
- Published by
- US Patent Office
- Series
- US Patent No. 2,193,040
- Date
- March 12, 1940
- Library no.
- ACL Doc 23356 · asbestosclaims.law/library/23356
- Rights
- US government work, in the public domain.
Read or download
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Where it was listed
- Asbestos, May 1940, in its patents department (the year's issues)
Cite this document
William Alfred Porter. “Pipes of Fibrocement (US Patent 2,193,040, 1940).” March 12, 1940. US Patent No. 2,193,040. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23356. https://asbestosclaims.law/library/23356.
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