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1.发明授权
公开(公告)号：US3149968A
公开(公告)日：1964-09-22
申请号：US7748260
申请日：1960-12-21
Applicant: STEPHENS LLOYD D
Inventor： STEPHENS LLOYD D
IPC: H01J43/28
CPC classification number: H01J43/28
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