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发明名称
Joint
摘要
申请公布号
US2779570(A)
申请公布日期
1957.01.29
申请号
US19530361289
申请日期
1953.06.12
申请人
HOUSTON OIL FIELD MATERIAL COMPANY, INC.
发明人
ROPER WINSTON R.
分类号
E21B7/06;E21B7/08;E21B17/04
主分类号
E21B7/06
代理机构
代理人
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地址
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