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公开(公告)号：US2170682A
公开(公告)日：1939-08-22
申请号：US16027837
申请日：1937-08-21
Applicant: GEN ELECTRIC
Inventor： FRECH THEODORE W , HOWARD ERNEST A , SEOTT KENNETH D
IPC: F21V5/00
CPC classification number: F21S41/28
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