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公开(公告)号：US2761207A
公开(公告)日：1956-09-04
申请号：US49481055
申请日：1955-03-16
Applicant: BAKER & CO INC
Inventor： DODD CLINTON R , HARTNETT THOMAS P , HAROLD ROBINSON
IPC: H01J19/30
CPC classification number: H01J19/30 , H01J2893/002 , Y10T29/49929
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