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公开(公告)号：US3498834A
公开(公告)日：1970-03-03
申请号：US3498834D
申请日：1967-02-03
Applicant: WESTON INSTRUMENTS INC
Inventor： ROME MARTIN , FRIEBERTSHAUSER ROBERT E , BENEDETTO JOSEPH S DI JR
CPC classification number: H01J9/12 , H01J1/34 , H01J2201/3426
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