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经营范围
发明名称
Straight hole drilling device
摘要
申请公布号
US1941723(A)
申请公布日期
1934.01.02
申请号
US19310533678
申请日期
1931.04.29
申请人
STROUD VOET E
发明人
STROUD VOET E.
分类号
E21B7/04;E21B10/26
主分类号
E21B7/04
代理机构
代理人
主权项
地址
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