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公开(公告)号：US2645142A
公开(公告)日：1953-07-14
申请号：US20711951
申请日：1951-01-22
Applicant: JAMES T CLARK
Inventor： OTTO SCHWENZFEIER
CPC classification number: H01T21/06 , B25B7/04 , B25B7/08 , B25B27/0035
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