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公开(公告)号：US2754489A
公开(公告)日：1956-07-10
申请号：US33986253
申请日：1953-03-02
Applicant: VECTOR MFG COMPANY
Inventor： RANDALL CLIFTON O , WEATHERSBY WARREN P , ZEPERNICK LAWRENCE D
IPC: G01V1/20
CPC classification number: G01V1/201
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