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公开(公告)号：US1593483A
公开(公告)日：1926-07-20
申请号：US69765024
申请日：1924-03-07
Applicant: MASASHI YAMAMOTO
Inventor： MASASHI YAMAMOTO
IPC: H01J21/20
CPC classification number: H01J21/20 , H01J2893/003
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