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公开(公告)号：US628530A
公开(公告)日：1899-07-11
申请号：US1898693622
申请日：1898-10-15
Applicant: RICHARD NICHOLSON , ROBERT JAMES NICHOLSON
Inventor： GOZZARD ALFRED
CPC classification number: B23B51/02 , Y10T279/10 , Y10T279/1008
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