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公开(公告)号：US1764048A
公开(公告)日：1930-06-17
申请号：US24090327
申请日：1927-12-17
Applicant: SUN RAY GAS CORP
Inventor： MADINE JOHN J
IPC: H01J17/00
CPC classification number: H01J17/00 , H01J2893/0064
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