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公开(公告)号：US2549566A
公开(公告)日：1951-04-17
申请号：US2979448
申请日：1948-05-28
Applicant: INSTR DEV LAB INC
Inventor： BENTLEY EDWARD P , BENTLEY GEORGE P
IPC: G01B11/06
CPC classification number: G01B11/06
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