Con-Cor Company began in 1959 as a two man soil testing company, soil boring lead to concrete coring "Core Drilling". In 1966 a partnership was formed between Orville Hoffmann and John Polzer. Con-Cor began with one office in Butler, WI, and a second shortly after, in Des Plaines, Illinois.

The concrete cutting industry was very small, our first larger scale job was a contract at O’Hare Field, for the Core Drilling of runway expansion lighting in 1969. This type of runway lighting was a developmental design with the light fixtures being embedded in the concrete. Con-Cor Company designed a coring rig that could power a 12" bit to drill thru 15" of concrete runway, and then remount a 24" bit to drill a 5" deep hole over the 24" hole, to recess the light fixtures.

In the early 1980’s the Construction Industry in Wisconsin was slow. The slowdown in the economy forced Con-Cor to look for other profitable opportunities. We had heard about Barn Floor Grooving, which the University of Wisconsin was experimenting with. Barn Floor Grooving was the cutting of concrete in the milking parlors so Dairy cows wouldn’t loose footing, and milk production remained steady. The application required 6 Diamond Blades to be mounted on a 65 HP Flat Saw that cut across the barn floors, providing edges for the Cows to catch their slipping hooves on. Con-Cor went Nation wide and grooved bams throughout 38 states.

Con-Cor also began to manufacture our own diamond core rigs and bits. This endeavor lead to the very popular Core Drill Machine we sell on our website. Sawing walls for remodeling and demolition became more and more popular. The Wisconsin Department of Transportation developed a repair instead of replace philosophy, and road repair became more popular in the 1980’s and early 90’s. We turned our focus to bidding of WI DOT State road work.

The 90’s came with many changes. Orv Hoffmann retired. John Polzer became ill and passed away, and Karen Polzer became President of the company in 1996. We remodeled offices, added a larger show room to improve sales of concrete cutting equipment. We took on equipment lines like, STIHL & HONDA. We developed the best parts and equipment repair division in for the Milwaukee area. And in 1998 Con- Cor Co Inc. received its DBE Certification from the Department of Transportation as a minority business.

Our Focus today remains on providing contractors safe, efficient, experienced service work with professionally trained operators and continued sales and repair of equipment to provide assistance to our valued customers.