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公开(公告)号：US1691447A
公开(公告)日：1928-11-13
申请号：US22765327
申请日：1927-10-21
Applicant: MAX SCHIESSER
Inventor： MAX SCHIESSER
IPC: H01J13/16
CPC classification number: H01J13/16 , H01J2893/0094
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