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公开(公告)号：US3200698A
公开(公告)日：1965-08-17
申请号：US13883961
申请日：1961-09-18
Applicant: NAT RES DEV
Inventor： DAVY FROOME KEITH , HOWARD BRADSELL ROBERT
IPC: G01S17/08
CPC classification number: G01S17/08
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