Vessel’s crane is the centerpiece of this state-of-the-art, technologically advanced workhorse platform. Sterling Equipment, Inc., an East Coast marine construction rental company based out of Quincy, Mass., has more than 135 pieces of floating equipment in commission, but its newest barge, a 180- x 65- x 12-foot crane dredge, will be among its largest and most technologically advanced. In September 2012, Sterling, a subsidiary of Jay Cashman, Inc., contracted May Shipyard on Staten Island, N.Y.