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发明名称
Rohrschutzaufsatz
摘要
申请公布号
DE19513232(A1)
申请公布日期
1995.10.12
申请号
DE19951013232
申请日期
1995.04.07
申请人
HYDRIL CO., LOS ANGELES, CALIF., US
发明人
CARLSON, DOUGLAS W., KINGWOOD, TEX., US;SIMONS, STEPHEN P., KINGWOOD, TEX., US
分类号
E21B17/10;E21B17/22;(IPC1-7):E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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