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公开(公告)号：US2072979A
公开(公告)日：1937-03-09
申请号：US44861330
申请日：1930-04-30
Applicant: BERTHA L CORDES
Inventor： CORDES BERTHA L
IPC: H01J3/02
CPC classification number: H01J3/025 , H01J2893/0061
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