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公开(公告)号：US3081531A
公开(公告)日：1963-03-19
申请号：US1924560
申请日：1960-04-01
Applicant: EITEL MCCULIOUGH INC
Inventor： SWARTZ PAUL C
IPC: H01J19/46
CPC classification number: H01J19/46 , H01J2893/0007 , Y10T29/53187 , Y10T29/53191 , Y10T29/53365
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