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公开(公告)号：US1552444A
公开(公告)日：1925-09-08
申请号：US69262524
申请日：1924-02-14
Applicant: SMITH ENGINEERING WORKS
Inventor： MUNRO ALEXANDER L , RUMPEL HARVEY H
IPC: B22D19/08
CPC classification number: B22D19/085
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