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发明名称
TUBE RETRACTING DEVICE
摘要
申请公布号
GB8819057(D0)
申请公布日期
1988.09.14
申请号
GB19880019057
申请日期
1988.08.11
申请人
COAL INDUSTRY (PATENTS) LTD
发明人
分类号
E21B23/04;E21B31/20
主分类号
E21B23/04
代理机构
代理人
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地址
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