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公开(公告)号：US1697281A
公开(公告)日：1929-01-01
申请号：US36407120
申请日：1920-03-08
Applicant: THL CUTLER HAMMER MFG CO
Inventor： WILHELM MEYER FRIEDRICH
CPC classification number: H01J13/34 , H01J17/40 , H01J2893/0087
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