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公开(公告)号：US2744073A
公开(公告)日：1956-05-01
申请号：US32198552
申请日：1952-11-22
Applicant: BATTELLE DEVELOPMENT CORP
Inventor： TODD FRANCIS C , WYLER EUGENE N
IPC: H01J1/144
CPC classification number: H01J1/144
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