Apparatus and method for locating subsurface objects in...

Apparatus and process for clearance of unexploded ordinance

Apparatus for determining the distance to a concealed conductive

Apparatus for determining the location and distance to a conceal

Apparatus for distinguishing false signals in cable locating

Apparatus for locating buried conductors using phase-shifted sig

Apparatus for locating concealed electrical conductors

Apparatus for observing the passage of a pig in a pipeline

Apparatus for remotely indicating pipeline pig including a senso

Apparatus for supplying AC current to an underwater cable

Apparatus for the detection of metal objects located within a po

Apparatus having a pair of magnetic field generating cables for

Apparatus including a pair of automatic gain controlled amplifie

Arrangement for detecting the location of an electrically insula

Arrangement using measured pitch and locating field...

Automatic classifier for electric wire detector

Automatic gain control for a line locator

Automatic impedance matching conduit locator

Avoiding ghosting artifacts during surface location of subsurfac

Balanced passive bandpass filter and preamplifier for a receiver