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Emil J. Poltorak received US Patent No. 2,533,742 on December 12, 1950, filed March 11, 1947. It was assigned to Johns Manville.
- Author
- Emil J. Poltorak
- Published by
- US Patent Office
- Series
- US Patent No. 2,533,742
- Date
- December 12, 1950
- Library no.
- ACL Doc 23567 · asbestosclaims.law/library/23567
- Rights
- US government work, in the public domain.
Read or download
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Where it was listed
- Asbestos, January 1951, in its patents department (the year's issues)
Cite this document
Emil J. Poltorak. “Ring packing and method of making the same (US Patent 2,533,742, 1950).” December 12, 1950. US Patent No. 2,533,742. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23567. https://asbestosclaims.law/library/23567.
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