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公开(公告)号：US2865340A
公开(公告)日：1958-12-23
申请号：US52904955
申请日：1955-08-17
Applicant: MIDWESTERN INSTR
Inventor： ATCHLEY RAYMOND D , O'BRIEN DONALD G
IPC: F15B9/17
CPC classification number: F15B9/17 , Y10T137/86606 , Y10T137/86614 , Y10T137/87201
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