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发明名称
Underground water swivel apparatus
摘要
申请公布号
US3303897(A)
申请公布日期
1967.02.14
申请号
US19630303600
申请日期
1963.08.21
申请人
E. J. LONGYEAR COMPANY
发明人
CASPER RAY K.
分类号
E21B21/02;E21B25/02
主分类号
E21B21/02
代理机构
代理人
主权项
地址
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