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公开(公告)号：US1153033A
公开(公告)日：1915-09-07
申请号：US3146615
申请日：1915-06-01
Applicant: COULSON WILLIS
Inventor： COULSON WILLIS
CPC classification number: B23B31/201 , B23Q1/0036 , Y10T279/17111
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