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公开(公告)号：US1340640A
公开(公告)日：1920-05-18
申请号：US26682718
申请日：1918-12-14
Applicant: HAMPTON ELECTRIC , MACH COMPANY
Inventor： WELCH LON L
IPC: B21J13/12
CPC classification number: B21J13/12
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