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发明名称
Hydraulic cement retaining shoe
摘要
申请公布号
US2872983(A)
申请公布日期
1959.02.10
申请号
US19550541657
申请日期
1955.10.20
申请人
LARKIN AND COMPANY INC.
发明人
RENOUF RALPH R.
分类号
E21B33/14
主分类号
E21B33/14
代理机构
代理人
主权项
地址
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