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经营范围
发明名称
Portable derrick
摘要
申请公布号
US2413149(A)
申请公布日期
1946.12.24
申请号
US19440542552
申请日期
1944.06.28
申请人
MCCARTHY ROBERT E;BENDER EMIL A
发明人
MCCARTHY ROBERT E.;BENDER EMIL A.
分类号
E21B15/00
主分类号
E21B15/00
代理机构
代理人
主权项
地址
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