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公开(公告)号：US3479516A
公开(公告)日：1969-11-18
申请号：US3479516D
申请日：1965-11-26
Applicant: NAT RES DEV
Inventor： MCGEE JAMES DWYER , BEESLEY JOHN , BERG ANTHONY DAVID
CPC classification number: H01J31/00 , H01J31/502
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