Believed to be Parker Hannifin, a corporation that continues to manufacture components for the railroad industry today - albeit defect detectors are no longer a part of their product line.

DED 1GG

A model specifically created for Conrail that is very simple in nature, with only inputs for a track circuit and dragging equipment paddle activation. There are no inputs for transducers, so the specific axle location of a defect can not be determined. This unit can accommodate up to 4 tracks.