Relay Counting Chains, Codes, and Translations in Dial Pulse Register Circuits
R. M. M. Oberman · Transactions of the American Institute of Electrical Engineers · 1951
Automatic telephone systems require some means for counting the pulses of the dialed number. This article presents a logical review of some of the systems used with the object of leading to the ideal solution of the least possible number of relays and contacts operating in a clear registration code.