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发明名称
Device for measuring ground water pressure
摘要
申请公布号
US3318140(A)
申请公布日期
1967.05.09
申请号
US19650434429
申请日期
1965.02.23
申请人
DONALD SHIELDS;KENNETH PEAKER
发明人
SHIELDS DONALD;PEAKER KENNETH
分类号
E02D1/02
主分类号
E02D1/02
代理机构
代理人
主权项
地址
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