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发明名称
CASING HEAD
摘要
申请公布号
JPH0565790(A)
申请公布日期
1993.03.19
申请号
JP19910329915
申请日期
1991.11.19
申请人
YAMAMOTO SEIKICHI
发明人
YAMAMOTO SEIKICHI
分类号
E21B10/16;E21B10/02;E21B10/48
主分类号
E21B10/16
代理机构
代理人
主权项
地址
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