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公开(公告)号：US3020794A
公开(公告)日：1962-02-13
申请号：US10030161
申请日：1961-04-03
Applicant: LEITZ ERNST GMBH
Inventor： ARTUR REICHEL
IPC: G01J3/06
CPC classification number: G01J3/06 , Y10T74/18024
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