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Norman P. Harshberger received US Patent No. 2,156,286 on May 2, 1939, filed June 15, 1935.
The patent's description opens (from the scanned text):
This invention relates to the manufacture of roofing materials andthe like and more particularly to a method and apparatus for applying a cement composition coating to a base such as an impregnated web having an asphalt coating in which mineral granules are embedded, commonly called asphalt roofing material.
- Author
- Norman P. Harshberger
- Published by
- US Patent Office
- Series
- US Patent No. 2,156,286
- Date
- May 2, 1939
- Library no.
- ACL Doc 22996 · asbestosclaims.law/library/22996
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 12 pages · 1.4 MB
Where it was listed
- Asbestos, June 1939, in its patents department (the year's issues)
Cite this document
Norman P. Harshberger. “Method and Apparatus for Making Building Materials (US Patent 2,156,286, 1939).” May 2, 1939. US Patent No. 2,156,286. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22996. https://asbestosclaims.law/library/22996.
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