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公开(公告)号：US1972611A
公开(公告)日：1934-09-04
申请号：US64733532
申请日：1932-12-15
Applicant: WARREN ROBERT A
Inventor： WARREN ROBERT A
IPC: H01J17/06
CPC classification number: H01J17/066 , H01J2893/0066
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