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公开(公告)号：US1660381A
公开(公告)日：1928-02-28
申请号：US3804225
申请日：1925-06-18
Applicant: FERNAND HOLWECK
Inventor： FERNAND HOLWECK
IPC: H01J5/30
CPC classification number: H01J5/30 , H01J2893/0047
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