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公开(公告)号：US1857608A
公开(公告)日：1932-05-10
申请号：US72883124
申请日：1924-07-29
Applicant: KARKER RICHTMYER FLOYD
Inventor： KARKER RICHTMYER FLOYD
IPC: H01J21/20
CPC classification number: H01J21/20 , H01J2893/003
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