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1.发明授权
公开(公告)号：US2659934A
公开(公告)日：1953-11-24
申请号：US22038251
申请日：1951-03-30
Applicant: PLAX CORP
Inventor： BURGESS JAMES Q
IPC: A61C13/00
CPC classification number: A61C13/0003 , Y10S229/94 , Y10S383/908
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