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经营范围
发明名称
Well forming apparatus
摘要
申请公布号
US1875357(A)
申请公布日期
1932.09.06
申请号
US19280272799
申请日期
1928.04.25
申请人
SIMMONS RICHARD P
发明人
SIMMONS RICHARD P.
分类号
E21B17/07
主分类号
E21B17/07
代理机构
代理人
主权项
地址
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DYNAMIC USER PANELS
