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公开(公告)号：US2974561A
公开(公告)日：1961-03-14
申请号：US63043356
申请日：1956-12-20
Applicant: RESEARCH CORP
Inventor： HARDY ARTHUR C , FOPIANO PAUL J , TRAGESER MILTON B
IPC: G01J4/04
CPC classification number: G01J4/04
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