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公开(公告)号：US2800929A
公开(公告)日：1957-07-30
申请号：US39220853
申请日：1953-11-16
Applicant: AVCO MFG CORP
Inventor： FRED WARNER , CALHOUN LENDON L , HERBE JAMES E
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/0025
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