Power Line Constructors, Inc. introduces unique trenching machine to the United States market.   This  machine enables an operator and crew to dig a trench, lay fiber optic cable, mark, backfill and bury the cable, all in a single pass.  This machine was used along the New York State Thruway to lay from six to twelve 1-1/4" innerducts along a 60 mile link, 36 miles of which was through rock subsurface.