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公开(公告)号：US2675150A
公开(公告)日：1954-04-13
申请号：US32565752
申请日：1952-12-12
Applicant: DOUGLAS ACKERMAN JOHN
Inventor： DOUGLAS ACKERMAN JOHN
IPC: A62B9/04
CPC classification number: A62B9/04 , Y10S224/934
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