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经营范围
发明名称
Rotary excavator
摘要
申请公布号
US2085336(A)
申请公布日期
1937.06.29
申请号
US19320648247
申请日期
1932.12.21
申请人
SANDSTONE HARVEY D
发明人
SANDSTONE HARVEY D.
分类号
E21B10/00;E21B10/34;E21D1/06
主分类号
E21B10/00
代理机构
代理人
主权项
地址
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