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公开(公告)号：US2702479A
公开(公告)日：1955-02-22
申请号：US18088350
申请日：1950-08-22
Applicant: STANDARD OIL DEV CO
Inventor： BLACK JAMES F , RAYMOND HAROLD D
IPC: H01J49/04
CPC classification number: H01J49/0431 , H01J49/0409 , Y10T137/88062
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