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公开(公告)号：US2838707A
公开(公告)日：1958-06-10
申请号：US60965456
申请日：1956-09-13
Applicant: DURO TEST CORP
Inventor： JOSEPH SCHWING , GERALD SCHIAZZANO
CPC classification number: H01J61/545 , H01J9/20 , H01J61/35
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