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Harry W. Porter and Jr William C. Boren received US Patent No. 2,009,068 on July 23, 1935, filed October 3, 1934.
The patent's description opens (from the scanned text):
The invention has been shown in connection with tiles or blocks for conduits but obviously the invention is equally susceptible to use in building blocks for other purposes.
- Author
- Harry W. Porter; Jr William C. Boren
- Published by
- US Patent Office
- Series
- US Patent No. 2,009,068
- Date
- July 23, 1935
- Library no.
- ACL Doc 23798 · asbestosclaims.law/library/23798
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 5 pages · 570 KB
Where it was listed
- Asbestos, September 1935, in its patents department (the year's issues)
Cite this document
Harry W. Porter, Jr William C. Boren. “Underground Conduit (US Patent 2,009,068, 1935).” July 23, 1935. US Patent No. 2,009,068. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23798. https://asbestosclaims.law/library/23798.
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