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发明名称
COUPLING
摘要
申请公布号
CA2032830(A1)
申请公布日期
1992.06.21
申请号
CA19902032830
申请日期
1990.12.20
申请人
STRAGHAN, ROBERT G.
发明人
STRAGHAN, ROBERT G.
分类号
E21B17/046;E21B47/01;F16L37/098
主分类号
E21B17/046
代理机构
代理人
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地址
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