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公开(公告)号：US2948556A
公开(公告)日：1960-08-09
申请号：US73170158
申请日：1958-04-29
Applicant: CENTRE NAT RECH SCIENT
Inventor： RAYMOND EPAIN , PIERRE JOHANNIN , BORIS VODAR
IPC: F16K41/02
CPC classification number: F16K41/02
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