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公开(公告)号：US2099830A
公开(公告)日：1937-11-23
申请号：US695535
申请日：1935-02-18
Applicant: SAMUEL STAHL
Inventor： SAMUEL STAHL
IPC: H01J17/48
CPC classification number: H01J17/48 , H01J2893/007
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