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发明名称
Spudding shoe
摘要
申请公布号
US1828269(A)
申请公布日期
1931.10.20
申请号
US19290406948
申请日期
1929.11.13
申请人
THE NATIONAL SUPPLY COMPANY
发明人
WRIGHT CLYDE S.
分类号
E21B1/02
主分类号
E21B1/02
代理机构
代理人
主权项
地址
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