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Walter L. Steffens received US Patent No. 1,974,519 on September 25, 1934, filed July 5, 1929.
The patent's description opens (from the scanned text):
My invention relates to insulation for build-' Fig. 2.
- Author
- Walter L. Steffens
- Published by
- US Patent Office
- Series
- US Patent No. 1,974,519
- Date
- September 25, 1934
- Library no.
- ACL Doc 22635 · asbestosclaims.law/library/22635
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 3 pages · 222 KB
Where it was listed
- Asbestos, November 1934, in its patents department (the year's issues)
Cite this document
Walter L. Steffens. “Heat Insulating Unit (US Patent 1,974,519, 1934).” September 25, 1934. US Patent No. 1,974,519. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22635. https://asbestosclaims.law/library/22635.
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