HDH

Rail construction materials made of metal, namely, metal rails, rail supports, and suspension tracks for monorails; building materials of metal, namely studs, joists, girders, wall panels, pipes, floors, roofs, and metal shoring; and metal pipes

Machines for mine and tunnel construction, namely boring machines, drilling cars, drill hammers, loading machines, vertical and lateral tilting loaders, hoist and manipulating equipment, namely extension lifts, roof supports, power jacks and jack stands, shoring machines, drilling machines, rock drills, drill mounts, cutter arms, drilling carriages, conveyor machines for mines, conveyor reels, regenerative brakes for machines, braking power generators, conveyor machines, belt conveyors and parts therefor and controls therefor

Lighting equipment, namely fixed and movable lighting fixtures, floodlights, spotlights and area lights for mining and tunnel construction and usage, and ancillary electrical switching equipment, namely switches, relays, controls, connectors and power cords and cables; ventilators for providing exhausting and moving air, fans; coolers and air handling and conditioning units and power generating plants

Non-metal construction materials, namely, non-metallic rigid pipes and tubes for buildings; asphalt, pitch, and bitumen; prefabricated non-metallic transportable buildings and parts therefor; and finished concrete shapes, namely, blocks, posts, slabs and panels, all for construction

Building construction, underground construction, mine and tunnel construction, engineering construction, excavating and erecting services therefore, blasting work, rental of construction equipment and construction tools for mine and tunnel construction