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公开(公告)号：US1901071A
公开(公告)日：1933-03-14
申请号：US49046230
申请日：1930-10-22
Applicant: ALLIS CHALMERS MFG CO
Inventor： HAROLD WINOGRAD
IPC: H01J13/32
CPC classification number: H01J13/32
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