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公开(公告)号：US2805365A
公开(公告)日：1957-09-03
申请号：US47997855
申请日：1955-01-05
Applicant: NORTH AMERICAN PHILLIPS COMPAN
Inventor： WILHELM MULDER JOHANNES GIJSBE
IPC: H01J3/02
CPC classification number: H01J3/025 , H01J2893/0061
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