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公开(公告)号：US667872A
公开(公告)日：1901-02-12
申请号：US1900028576
申请日：1900-08-30
Applicant: EMERY JOHN E , STEWART WILLIAM H JR
Inventor： EMERY JOHN E , STEWART WILLIAM H JR
CPC classification number: B23D61/123
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