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经营范围
发明名称
Signal transmitters
摘要
申请公布号
US4956823(A)
申请公布日期
1990.09.11
申请号
US19880286299
申请日期
1988.12.19
申请人
RUSSELL, MICHAEL K.;RUSSELL, ANTHONY W.
发明人
RUSSELL, MICHAEL K.;RUSSELL, ANTHONY W.
分类号
E21B47/18
主分类号
E21B47/18
代理机构
代理人
主权项
地址
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