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William D. Callan received US Patent No. 2,396,826 on March 19, 1946, filed January 26, 1942.
The patent's description opens (from the scanned text):
This invention relates to conduits, particularly air conduits for use in air conditioning or ventilating systems, which are composed of boards that may be readily assembled into conduits of dilerent sizes without fastening, except -cement for sealing the joints, other than interlocking means provided on the longitudinal edges o'f the boards.
- Author
- William D. Callan
- Published by
- US Patent Office
- Series
- US Patent No. 2,396,826
- Date
- March 19, 1946
- Library no.
- ACL Doc 21658 · asbestosclaims.law/library/21658
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 4 pages · 384 KB
Where it was listed
- Asbestos, May 1946, in its patents department (the year's issues)
Cite this document
William D. Callan. “Air Conduit (US Patent 2,396,826, 1946).” March 19, 1946. US Patent No. 2,396,826. US Patent Office. AsbestosClaims.Law Library, ACL Doc 21658. https://asbestosclaims.law/library/21658.
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