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经营范围
发明名称
Traction apparatus
摘要
申请公布号
GB9903322(D0)
申请公布日期
1999.04.07
申请号
GB19990003322
申请日期
1997.08.15
申请人
ASTEC DEVELOPMENTS LIMITED
发明人
分类号
E21B23/00;E21B23/04;E21B23/08;E21B23/14;E21B37/04;F16L55/26
主分类号
E21B23/00
代理机构
代理人
主权项
地址
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