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公开(公告)号：US2715668A
公开(公告)日：1955-08-16
申请号：US31652252
申请日：1952-10-23
Applicant: ELECTROFILM INC
Inventor： BOOKER AYLWIN R , CRUMP RALPH E
IPC: F24C7/04
CPC classification number: F24C7/043
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