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经营范围
发明名称
Rock drills
摘要
申请公布号
US3065806(A)
申请公布日期
1962.11.27
申请号
US19520299186
申请日期
1952.07.16
申请人
JOY MANUFACTURING COMPANY
发明人
THOMPSON CHARLES T.
分类号
E21B19/087
主分类号
E21B19/087
代理机构
代理人
主权项
地址
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