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公开(公告)号：US3180346A
公开(公告)日：1965-04-27
申请号：US24968363
申请日：1963-01-07
Applicant: MIDWESTERN INSTR INC
Inventor： DUFF BILIY E
IPC: F15B13/043
CPC classification number: F15B13/0436 , Y10T137/2213 , Y10T137/2229
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