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John W. Ledeboer received US Patent No. 1,982,314 on November 27, 1934, filed May 24, 1932. It was assigned to Keasbey and Mattison Co.
The patent's description opens (from the scanned text):
This invention relates to boards or slabs of insulating material composed of Portland cement and an inert material impregnated with an insulating compound to give a permanent dielectric strength to the board or slab.
- Author
- John W. Ledeboer
- Published by
- US Patent Office
- Series
- US Patent No. 1,982,314
- Date
- November 27, 1934
- Library no.
- ACL Doc 23297 · asbestosclaims.law/library/23297
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 2 pages · 178 KB
Where it was listed
- Asbestos, January 1935, in its patents department (the year's issues)
Cite this document
John W. Ledeboer. “Panel Board (US Patent 1,982,314, 1934).” November 27, 1934. US Patent No. 1,982,314. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23297. https://asbestosclaims.law/library/23297.
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