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公开(公告)号：US2004246A
公开(公告)日：1935-06-11
申请号：US75635434
申请日：1934-12-06
Applicant: SOVERIGN MACHINERY COMPANY
Inventor： HENRY KERSHAW
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/0022 , Y10T29/49218 , Y10T29/49222 , Y10T29/49798
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