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公开(公告)号：US1691946A
公开(公告)日：1928-11-20
申请号：US8750426
申请日：1926-02-11
Applicant: TOLMIE JACK R , LIBBY TYNG M
Inventor： TOLMIE JACK R , LIBBY TYNG M
IPC: H01J21/20
CPC classification number: H01J21/20 , H01J2893/003
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