PETROLEUM AND NATURAL GAS DRILLING SERVICES; WORKOVER AND RECONDITIONING OF PETROLEUM AND NATURAL GAS WELLS; MAINTENANCE OF INTERSTATE WATERWAY SYSTEMS, PORTS, TIPPLES AND FREIGHT CONSOLIDATION CENTERS; CONSTRUCTION AND REPAIR OF PROPERTIES, MACHINERY, PLANTS, BARGES, SHIPS, HARBORS, WATERWAYS, PLATFORMS, PIPELINES AND OTHER APPURTENANCES CONNECTED WITH PETROLEUM PROCESSING AND TRANSPORTATION, MARINE AND INLAND FACILITIES