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经营范围
发明名称
Improvements in or relating to fishing spears used in well drilling
摘要
申请公布号
GB355577(A)
申请公布日期
1931.08.27
申请号
GB19300031550
申请日期
1930.10.21
申请人
ACME FISHING TOOL CO.
发明人
分类号
E21B31/20
主分类号
E21B31/20
代理机构
代理人
主权项
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