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公开(公告)号：US2924242A
公开(公告)日：1960-02-09
申请号：US70207857
申请日：1957-12-11
Applicant: INT BASIC ECONOMY CORP
Inventor： WHITE ROBERT D
IPC: F16K31/40
CPC classification number: F16K31/40 , Y10T137/86614
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