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发明名称
Well scratcher
摘要
申请公布号
US2881839(A)
申请公布日期
1959.04.14
申请号
US19550542272
申请日期
1955.10.24
申请人
B AND W, INC.
发明人
WRIGHT KENNETH A.;SOLUM JAMES R.;HEMPEL WILLIAM C.
分类号
E21B37/02
主分类号
E21B37/02
代理机构
代理人
主权项
地址
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