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发明名称
Feeding and counting system for injecting balls into a flow stream
摘要
申请公布号
US2961046(A)
申请公布日期
1960.11.22
申请号
US19580737716
申请日期
1958.05.26
申请人
HALLIBURTON OIL WELL CEMENTING COMPANY
发明人
MOELLER ROBERT E.;STOGNER JOEL M.
分类号
E21B33/068
主分类号
E21B33/068
代理机构
代理人
主权项
地址
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