Such units were usually called radiograms or stereograms. Military organizations have historically used radiograms for transmitting messages. Fellers' radiograms provided to the Axis detailed information about troop movements and equipment. In use, ARRL Numbered Radiograms are messages encoded as one or two numbers. For this reason, deciphered army radiograms were never included in the daily VN's. When army radiograms were solved, there was no hard or fast criteria for evaluation. The Khodynka radio station, built in 1914, couldn't longer handle the increasing amount of radiograms. Fellers' radiograms provided detailed information about troop movements and equipment to the Axis. International radiotelegraphy was expensive so radiograms were mostly used for business and commercial communication. Police radiograms had their own format, likely derived from the commercial radiogram format. However Slaby's radiograms were rejected by Marconi station, because the licensing had forbidden this action.