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发明名称
Rock drilling apparatus
摘要
申请公布号
US2913225(A)
申请公布日期
1959.11.17
申请号
US19560624128
申请日期
1956.11.23
申请人
WOLFRAM NORMAN E
发明人
WOLFRAM NORMAN E.
分类号
E21B21/00
主分类号
E21B21/00
代理机构
代理人
主权项
地址
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