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经营范围
发明名称
Drift recording apparatus
摘要
申请公布号
US2126740(A)
申请公布日期
1938.08.16
申请号
US19360107215
申请日期
1936.10.23
申请人
TECHNICAL OIL TOOL CORPORATION, LTD.
发明人
CULBERTSON JOE W.
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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