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公开(公告)号：US2426522A
公开(公告)日：1947-08-26
申请号：US57211145
申请日：1945-01-10
Applicant: HEATHWAY ENGINEERING COMPANY L
Inventor： ALBERT PORTER CHARLES BENJAMIN
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/0026
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