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Walter L. Steffens received US Patent No. 1,765,312 on June 17, 1930, filed April 8, 1925. It was assigned to Philip Carey Manufacturing Co.
- Author
- Walter L. Steffens
- Published by
- US Patent Office
- Series
- US Patent No. 1,765,312
- Date
- June 17, 1930
- Library no.
- ACL Doc 22779 · asbestosclaims.law/library/22779
- Rights
- US government work, in the public domain.
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Where it was listed
- Asbestos, July 1930, in its patents department (the year's issues)
Cite this document
Walter L. Steffens. “Insulating Materials (US Patent 1,765,312, 1930).” June 17, 1930. US Patent No. 1,765,312. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22779. https://asbestosclaims.law/library/22779.
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