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John Ferla received US Patent No. 2,177,643 on October 31, 1939, filed January 12, 1938.
The patent's description opens (from the scanned text):
The invention relates to a method of manufacturing tubes of a composition material, such. as asbestos and cement, or pulp material.
- Author
- John Ferla
- Published by
- US Patent Office
- Series
- US Patent No. 2,177,643
- Date
- October 31, 1939
- Library no.
- ACL Doc 22277 · asbestosclaims.law/library/22277
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 7 pages · 655 KB
Where it was listed
- Asbestos, December 1939, in its patents department (the year's issues)
Cite this document
John Ferla. “Fibrous Cementitious Tubes (US Patent 2,177,643, 1939).” October 31, 1939. US Patent No. 2,177,643. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22277. https://asbestosclaims.law/library/22277.
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