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发明名称
Rotating spear
摘要
申请公布号
US1813459(A)
申请公布日期
1931.07.07
申请号
US19290374181
申请日期
1929.06.27
申请人
MILLER WILLIAM J
发明人
MILLER WILLIAM J.
分类号
E21B31/20
主分类号
E21B31/20
代理机构
代理人
主权项
地址
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