E.F. Johnson Company - A history of the company and some old magazine advertisements from 1929-1960.What is Two Way Radio? - history, information, and regulation.
AT& T Labs Research - nearly half a century of AT&T inventions and scientific milestones in communications technology. See the first fax machine, learn about transatlantic calls, high-definition television and the artificial larynx.
L.A.P.D. Communications - Photo Gallery and Links - KMA367: Unofficial History of the Los Angeles Police Department Communications Division: RTO's, Link Officers, Radios, LAPD L.A.P.D. Scanner
