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发明名称
Trykkmodulator for overföring av signaler i form av trykkpulser i en fluidström
摘要
申请公布号
NO301785(B1)
申请公布日期
1997.12.08
申请号
NO19900001412
申请日期
1990.03.28
申请人
SCHLUMBERGER CANADA LTD
发明人
GOODSMAN, WILLIAM GORDON
分类号
E21B;E21B47/18;E21B47/20;E21B47/24;(IPC1-7):E21B47/18
主分类号
E21B
代理机构
代理人
主权项
地址
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