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公开(公告)号：US2990491A
公开(公告)日：1961-06-27
申请号：US75174758
申请日：1958-07-29
Applicant: NORTH AMERICAN PHILLIPS COMPAN
Inventor： HENDEE CHARLES F , SAMUEL FINE
IPC: H01J65/06
CPC classification number: H01J65/06
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