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John C. Macildowie received US Patent No. 2,168,445 on August 8, 1939, filed March 7, 1936. It was assigned to Johns Manville.
The patent's description opens (from the scanned text):
This invention relates to an article of manufacture, particularly to a blackboard or blackboard base.
- Author
- John C. Macildowie
- Published by
- US Patent Office
- Series
- US Patent No. 2,168,445
- Date
- August 8, 1939
- Library no.
- ACL Doc 21735 · asbestosclaims.law/library/21735
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 3 pages · 277 KB
Where it was listed
- Asbestos, September 1939, in its patents department (the year's issues)
Cite this document
John C. Macildowie. “Article of Manufacture (Blackboard) (US Patent 2,168,445, 1939).” August 8, 1939. US Patent No. 2,168,445. US Patent Office. AsbestosClaims.Law Library, ACL Doc 21735. https://asbestosclaims.law/library/21735.
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