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公开(公告)号：US2996078A
公开(公告)日：1961-08-15
申请号：US5043160
申请日：1960-08-18
Applicant: IBM
Inventor： FREEMAN MARSHALL E , GILMORE JAMES C
CPC classification number: F16K31/40 , F15B13/04 , Y10T137/86622 , Y10T137/86702
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