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经营范围
发明名称
Device for measuring length of a line run into or removed from a bore hole
摘要
申请公布号
US2401576(A)
申请公布日期
1946.06.04
申请号
US19430503331
申请日期
1943.09.22
申请人
MASON RICHARD C
发明人
MASON RICHARD C.
分类号
E21B47/04
主分类号
E21B47/04
代理机构
代理人
主权项
地址
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