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公开(公告)号：US1969566A
公开(公告)日：1934-08-07
申请号：US63846932
申请日：1932-10-19
Applicant: BERKMONT COMPANY
Inventor： THEODORE KOWVALLIS
IPC: H01J17/00
CPC classification number: H01J17/00 , H01J2893/0064
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