Equipment may include but is not limited to the following: air compressors, welding systems, cranes, mobile equipment, CNC equipment, plumbing, pneumatics, hydraulics, electrical, motors, pumps, controls, HVAC, mixers, conveyors, etc. Working for The High Companies: High Concrete Group LLC combines innovation, proven technology, more than three-quarters of a century's experience as a precast company, and nearly 50 years as a precaster.