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发明名称
Drilling apparatus
摘要
申请公布号
US2594098(A)
申请公布日期
1952.04.22
申请号
US19460652729
申请日期
1946.03.07
申请人
JOY MANUFACTURING COMPANY
发明人
VANDERZEE HARRY H.
分类号
E21B7/02;E21B19/084;E21B44/02
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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