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公开(公告)号：US2303174A
公开(公告)日：1942-11-24
申请号：US37589241
申请日：1941-01-25
Applicant: WESTERN ELECTRIC CO
Inventor： ROGERS ALFRED N , SHULL SHERMAN K
IPC: H01J40/04
CPC classification number: H01J40/04
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