The Working Group was formed at the IAU XXV General Assembly in Sydney, 2003, as a joint initiative of Commissions 40 Radio Astronomy and Commission 41 History of Astronomy, in order to assemble a master list of surviving historically-significant radio telescopes and associated instrumentation found worldwide, and document the technical specifications and scientific achievements of these instruments. In addition, it would maintain an on-going bibliography of publications on the history of radio astronomy, and monitor other developments relating to the history of radio astronomy (including the deaths of pioneering radio astronomers).