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公开(公告)号：US3209457A
公开(公告)日：1965-10-05
申请号：US3103060
申请日：1960-05-23
Applicant: RITTER CO INC
Inventor： GILBERT BILLIN ARTHUR , STEWART TYLER C
IPC: A61C1/00
CPC classification number: A61C1/0007
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