WOC's history is also complex. Effective December 1, 1921, the U.S. government adopted a regulation requiring that stations making broadcasts intended for the public now had to hold a Limited Commercial license. On February 18, 1922 the Karlowa Radio Corporation was issued a new license, for a broadcasting station with the randomly assigned call letters of WOC, still located in the Rock Island Best Building. Karlowa continued to operate the station for a short time, but the costs had become too great. In March he sold WOC to Col. B. J. Palmer, and on May 9, 1922 a new license was issued for the Palmer School of Chiropractic (later the Palmer College of Chiropractic) in Davenport, Iowa, the start of a family connection that lasted almost 75 years.