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经营范围
发明名称
SIGNALING SYSTEM
摘要
申请公布号
US3603923(A)
申请公布日期
1971.09.07
申请号
USD3603923
申请日期
1968.09.10
申请人
SCHLUMBERGER TECHNOLOGY CORP.
发明人
WILLIAM B. NELLIGAN
分类号
E21B47/12;(IPC1-7):H04J3/02
主分类号
E21B47/12
代理机构
代理人
主权项
地址
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