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发明名称
Well cleaning device
摘要
申请公布号
US2059627(A)
申请公布日期
1936.11.03
申请号
US19330667437
申请日期
1933.04.22
申请人
JOHN GRANT
发明人
ERWIN WELDON C.;SWEET CECIL H.
分类号
E21B37/08
主分类号
E21B37/08
代理机构
代理人
主权项
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