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公开(公告)号：US1240729A
公开(公告)日：1917-09-18
申请号：US14937617
申请日：1917-02-17
Applicant: KASPERSON FRANK H
Inventor： KASPERSON FRANK H
CPC classification number: B23B31/1253 , Y10T279/17701 , Y10T279/17743
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公开(公告)号：US986829A
公开(公告)日：1911-03-14
申请号：US1909507364
申请日：1909-07-13
Applicant: KASPERSON FRANK H
Inventor： KASPERSON FRANK H
CPC classification number: B23B51/123 , Y10T279/17965 , Y10T279/3406
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