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公开(公告)号：US2197802A
公开(公告)日：1940-04-23
申请号：US22398838
申请日：1938-08-09
Applicant: PATERSON JAMES JACK
Inventor： PATERSON JAMES JACK
IPC: G07C9/00
CPC classification number: G07C9/0069 , Y10T70/7068
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