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公开(公告)号：US935977A
公开(公告)日：1909-10-05
申请号：US1908422654
申请日：1908-03-23
Applicant: HASKELL HENRY W
Inventor： HASKELL HENRY W
CPC classification number: B23B31/201 , Y10T279/17521 , Y10T279/17863 , Y10T279/3406
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