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发明名称
Feeding pressure control for earth boring apparatus
摘要
申请公布号
US1926119(A)
申请公布日期
1933.09.12
申请号
US19270227156
申请日期
1927.10.19
申请人
EGGLESTON DRILLING CORPORATION
发明人
SMITH EGGLESTON
分类号
E21B19/08
主分类号
E21B19/08
代理机构
代理人
主权项
地址
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