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公开(公告)号：US2872650A
公开(公告)日：1959-02-03
申请号：US56589156
申请日：1956-02-16
Applicant: MONOGRAM PREC IND INC
Inventor： WINKLER RICHARD H
IPC: H01J23/28
CPC classification number: H01J23/28
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