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公开(公告)号：US2239574A
公开(公告)日：1941-04-22
申请号：US30292339
申请日：1939-11-04
Applicant: THERMOID COMPANY
Inventor： SCHELL CARL A
CPC classification number: F16D69/0416 , F16D2069/005 , F16D2069/0433
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