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发明名称
Method and means for installing drainage conduits
摘要
申请公布号
US2136152(A)
申请公布日期
1938.11.08
申请号
US19370120980
申请日期
1937.01.16
申请人
MARGARET PARRISH;JANE PARRISH
发明人
PARRISH ALAN JAY
分类号
E21B7/00
主分类号
E21B7/00
代理机构
代理人
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地址
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