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公开(公告)号：US1550179A
公开(公告)日：1925-08-18
申请号：US66757623
申请日：1923-10-09
Applicant: GEN ELECTRIC TRIC COMPANY
Inventor： MARCELLUS FREDRICK S
IPC: G01R31/36
CPC classification number: G01R31/36 , G01R31/3617
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