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公开(公告)号：US3056902A
公开(公告)日：1962-10-02
申请号：US137760
申请日：1960-01-08
Applicant: VARIAN ASSOCIATES
Inventor： LLOYD WILLIAM A , RENN ZAPHIROPOULOS
IPC: H01J41/20
CPC classification number: H01J41/20
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