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公开(公告)号：US2728222A
公开(公告)日：1955-12-27
申请号：US25052651
申请日：1951-10-09
Applicant: LEITZ ERNST GMBH
Inventor： HELMUT BECKER , OSWALD BENDER , LUDWIG BERGMANN , KARLHEINZ ROST , ALFRED ZOBEL
IPC: G01B7/34
CPC classification number: G01B7/34
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