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, flexible towed barges.