Before revision: Gamewell Diaphone Technical Information, accessed 2008-09-09 Working diaphone installations The following installations are still functional and are demonstrated from time to time as tourist attractions.
After revision: A noon test of a Gamewell DiaphoneGamewell Diaphone Technical Information, accessed 2008-09-09 Working diaphone installations The following installations are still functional and are demonstrated from time to time as tourist attractions.