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John W. Ledeboer received US Patent No. 1,856,570 on May 3, 1932.
The patent's description opens (from the scanned text):
This invention relates to the production of 1 sheets or slabs of cement and fibre composition.
- Author
- John W. Ledeboer
- Published by
- US Patent Office
- Series
- US Patent No. 1,856,570
- Date
- May 3, 1932
- Library no.
- ACL Doc 22010 · asbestosclaims.law/library/22010
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 3 pages · 194 KB
Where it was listed
- Asbestos, July 1932, in its patents department (the year's issues)
Cite this document
John W. Ledeboer. “Cement Product (US Patent 1,856,570, 1932).” May 3, 1932. US Patent No. 1,856,570. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22010. https://asbestosclaims.law/library/22010.
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