115 Years of Experience – Established 1907 – Chicago’s First Registered Electrical Contractor ABOUT GRAND KAHN ESTABLISHED IN 1907 AND PROUD TO BE CHICAGO’S FIRST REGISTERED ELECTRICAL CONTRACTOR. OUR HISTORY OUR SERVICES NCH Outpatient Care Center Westmont Medical Office Building FBRK Impact House TTX DuPage Medical Group Lockport Medical Office Building Capgemini Conversant Hyatt Regency Woodfield MORE EXPERIENCE