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公开(公告)号：US2650884A
公开(公告)日：1953-09-01
申请号：US20342650
申请日：1950-12-29
Applicant: RAULAND CORP
Inventor： SERGE PAKSWER , INTISO PHILOMENA C
IPC: H01J29/28
CPC classification number: H01J29/28
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