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发明名称
Reading instrument
摘要
申请公布号
US2327659(A)
申请公布日期
1943.08.24
申请号
US19400338444
申请日期
1940.06.01
申请人
EASTMAN OIL WELL SURVEY COMPANY;EASTMAN OIL WELL SURVEY CORPORATION
发明人
MILLER LEONIDAS C.
分类号
E21B47/022
主分类号
E21B47/022
代理机构
代理人
主权项
地址
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