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公开(公告)号：US943775A
公开(公告)日：1909-12-21
申请号：US1908467825
申请日：1908-12-16
Applicant: EXTON ALFRED H , SHERRERD JOHN M
Inventor： EXTON ALFRED H , SHERRERD JOHN M
CPC classification number: E02F9/2825
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