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公开(公告)号：US2776392A
公开(公告)日：1957-01-01
申请号：US31500152
申请日：1952-10-16
Applicant: COLAIACO AUGUST P
Inventor： COLAIACO AUGUST P
CPC classification number: H01J13/04 , H01J13/22 , H01J2893/0074
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