Con-Cor Company, Inc. began in 1959. One of the founding partners, John Polzer entered the Company in 1966. Con-Cor started with one office in Butler, Wisconsin, and a second shortly after, in Des Plaines, Illinois. The concrete cutting theory was new to the Construction Industry. Our first large-scale job was at O’Hare Field, Core Drilling for the runway expansion lighting in 1969.

This type of runway lighting was a developmental design with light fixtures embedded in the concrete. Con-Cor designed a core drill rig that could power  a 12” bit that could drill through 15” of solid concrete runway and then remount a 24” bit to countersink a 5″ deep hole around the 15″ hole, to recess the light fixtures.