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John W. Ledeboer received US Patent No. 2,183,965 on December 19, 1939, filed March 9, 1937. It was assigned to Keasbey and Mattison Co.
The patent's description opens (from the scanned text):
This invention relates to shingles of Portland cement and fiber composition.
- Author
- John W. Ledeboer
- Published by
- US Patent Office
- Series
- US Patent No. 2,183,965
- Date
- December 19, 1939
- Library no.
- ACL Doc 23652 · asbestosclaims.law/library/23652
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 3 pages · 272 KB
Where it was listed
- Asbestos, February 1940, in its patents department (the year's issues)
Cite this document
John W. Ledeboer. “Shingles (US Patent 2,183,965, 1939).” December 19, 1939. US Patent No. 2,183,965. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23652. https://asbestosclaims.law/library/23652.
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