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公开(公告)号:US1562403A
公开(公告)日:1925-11-17
申请号:US75685924
申请日:1924-12-19
Applicant: WESTERN ELECTRIC CO
Inventor: WILSON JAMES R
IPC: H01J1/18
CPC classification number: H01J1/18
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公开(公告)号:US1722121A
公开(公告)日:1929-07-23
申请号:US3944725
申请日:1925-06-25
Applicant: WESTERN ELECTRIC CO
Inventor: WILSON JAMES R
IPC: H01J19/30
CPC classification number: H01J19/30 , H01J2893/002
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