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经营范围
发明名称
Polish rod steps
摘要
申请公布号
US2745703(A)
申请公布日期
1956.05.15
申请号
US19540451137
申请日期
1954.08.20
申请人
SKINNER BROTHERS COMPANY
发明人
ROSE ROBERT E.
分类号
E21B19/10;E21B41/00;F16D41/06
主分类号
E21B19/10
代理机构
代理人
主权项
地址
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