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发明名称
APPARATUS FOR FREEING OIL WELLS FROM FROZEN MATERIAL
摘要
申请公布号
CA306423(A)
申请公布日期
1930.12.02
申请号
CAD306423
申请日期
申请人
RUSSELL ROGERS SMITH
发明人
RUSSELL ROGERS SMITH
分类号
主分类号
代理机构
代理人
主权项
地址
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