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公开(公告)号：US2943206A
公开(公告)日：1960-06-28
申请号：US64167857
申请日：1957-02-21
Applicant: NAT RES DEV
Inventor： DWYER MCGEE JAMES , DEVEREUX EVANS HUGH
CPC classification number: H01J29/023 , H01J29/385 , H01J31/506
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