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经营范围
发明名称
Auger head
摘要
申请公布号
US2705128(A)
申请公布日期
1955.03.29
申请号
US19500149831
申请日期
1950.03.15
申请人
AUSTIN POWDER COMPANY
发明人
MCCLENNAN MORTON
分类号
E21B10/42;E21B10/43;E21B10/44;E21B10/60
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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