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公开(公告)号：US2947912A
公开(公告)日：1960-08-02
申请号：US72683258
申请日：1958-04-07
Applicant: NAT RES DEV
Inventor： RICHARD HOFFMAN GEORGE , HAYES CHELTENHAM ROY ERNEST
IPC: H01J29/18
CPC classification number: H01J29/18
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