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经营范围
发明名称
Improvements in or relating to derricks
摘要
申请公布号
GB691143(A)
申请公布日期
1953.05.06
申请号
GB19510001994
申请日期
1951.01.26
申请人
AKTIENGESELLSCHAFT FUR BERGBAUUND HUTTENBEDARF
发明人
分类号
E21B15/00
主分类号
E21B15/00
代理机构
代理人
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