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公开(公告)号：US1750482A
公开(公告)日：1930-03-11
申请号：US71803224
申请日：1924-06-05
Applicant: ADOLF GUSTAV KOLLMANN
Inventor： FRANZ MATOUCH RUDOLF ANTON
CPC classification number: H01J13/00 , H01J61/58 , H01J2893/0095
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