37 Construction, installation, maintenance, repair, and servicing of desalination units, desalination plants and facilities, water treatment units, water treatment plants and facilities, water purification units, water purification plants and facilities, water storage units, pipelines, buoys, and docks; maintenance, repair, and servicing of ships; leasing of desalination units and plants; leasing of water purification units and plants; and leasing of water treatment units and plants