发明名称 Method of finding an above-ground point in relation to an in-ground boring tool
摘要 The present invention provides a locator/monitor capable of locating a boring tool and monitoring the progress of the tool for control purposes. The locator/monitor may be used in expedited locating methodology and straightforward calibration techniques of the present invention. A durable and cost effective pitch sensor is also provided by the present invention. In addition, the present invention provides a slotted transmitter housing formed of an electrically conductive material, where the magnetic field generated by the transmitter is capable of penetrating to the surface.
申请公布号 US5926025(A) 申请公布日期 1999.07.20
申请号 US19980059240 申请日期 1998.04.13
申请人 DIGITAL CONTROL, INC. 发明人 MERCER, JOHN E.
分类号 E21B47/022;G01C9/06;G01C9/20;G01V3/11;G01V3/15;G01V3/165;(IPC1-7):G01V3/11;H04B13/02 主分类号 E21B47/022
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