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公开(公告)号：US2143920A
公开(公告)日：1939-01-17
申请号：US10630636
申请日：1936-10-19
Applicant: LEE ENGINEERING RES CORP
Inventor： ROYAL LEE , LUEDERS WARREN E
IPC: H02P25/18
CPC classification number: H02P25/182
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