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公开(公告)号：US3051537A
公开(公告)日：1962-08-28
申请号：US81934159
申请日：1959-06-10
Applicant: CARL SCHNEIDER FA
Inventor： LUDWIG DIEHL , HEINRICH FUCHS JOHANN
IPC: G03B21/32
CPC classification number: G03B21/323
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