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公开(公告)号：US3513348A
公开(公告)日：1970-05-19
申请号：US3513348D
申请日：1967-12-07
Applicant: MACHLETT LAB INC
Inventor： RANDMER JACOB A , PETER ERICH C
CPC classification number: H01J1/18 , H01J19/42 , H01J2893/0005
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