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公开(公告)号：US1898626A
公开(公告)日：1933-02-21
申请号：US50496130
申请日：1930-12-26
Applicant: HEALY DAVIDSON CORP
Inventor： HEALY WESLEY P
IPC: H01J17/48
CPC classification number: H01J17/48 , H01J2893/007 , Y10S315/01
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