 However, effective December 1, 1921, the Department of Commerce, which regulated U.S. radio at this time, adopted a regulation that stations making general broadcasts now had to hold a Limited Commercial license.To comply with this new standard, the Reynolds Radio Company applied for the appropriate license, and on March 10, 1922 a broadcasting station authorization — the first in the state of Colorado — with the randomly assigned call letters of KLZ was issued to the company.KLZ was given permission to use both of the broadcasting wavelengths established by the new regulations