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公开(公告)号：US2648061A
公开(公告)日：1953-08-04
申请号：US79420847
申请日：1947-12-29
Applicant: NAT RES DEV
Inventor： ERIC PARKER , WALLIS PETER R , ALEXANDER WORONCOW
IPC: G01S7/20
CPC classification number: G01S7/20 , G01S2007/403 , G01S2007/4034
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