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公开(公告)号：US2276939A
公开(公告)日：1942-03-17
申请号：US32977140
申请日：1940-04-15
Applicant: DAVIS KENNETH W
Inventor： DAVIS KENNETH W
IPC: F16K3/36
CPC classification number: F16K3/36 , Y10T137/4379
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