Special Purpose Barges and Lighters
Includes derrick, piledriver, and rock cutter barges, barrage balloon, catapult lighter, and torpedo testing barges, concrete mixing plant, mechanical bank grader, and other bank revetment barges, fire, smudge removal, and other pump barges, houseboats, except yacht type, power plant barges, refrigeration barges, barge mounted cranes and flexible towed barges.