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1.发明授权
公开(公告)号：US1658659A
公开(公告)日：1928-02-07
申请号：US66684123
申请日：1923-10-05
Applicant: GEN ELECTRIC
Inventor： FRANZ SKAUPY , HANS HOFFMANN , HELMUTH SCHMIDT
IPC: H01K1/12
CPC classification number: H01K1/12
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