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发明名称
WIRE LINE CORE BARREL APPARATUS
摘要
申请公布号
US3461981(A)
申请公布日期
1969.08.19
申请号
USD3461981
申请日期
1968.04.30
申请人
E.J. LONGYEAR CO.
发明人
RAY K. CASPER;ALBERT L. LINN
分类号
E21B25/02;(IPC1-7):E21B9/20;E21B25/00
主分类号
E21B25/02
代理机构
代理人
主权项
地址
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