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• Rural Radiotelephone Service | Federal Communications Commission
  Rural Radiotelephone spectrum is used to provide basic, analog, telephone service to subscribers in locations deemed so remote that traditional ...
  https://www.fcc.gov/wireless/bureau-divisions/mobility-division/rural-radiotelephone-service
• Radiotelephone - Wikipedia
  A radiotelephone (or radiophone), abbreviated RT, refers to a radio communication system for conducting a conversation; radiotelephony means telephony by ...
  https://en.wikipedia.org/wiki/Radiotelephone
• Radiotelephone Communication Explained | PDF - Scribd
  Radiotelephone communication is a system that allows for the transmission of speech over radio waves, enabling two-way communication between correspondents
  https://www.scribd.com/document/354447532/What-is-Radiotelephone-Communication
• What is a Restricted Radiotelephone Operator Permit used for?
  It was required to operate a commercial/aeronautical/maritime, etc. radio transmiter. Disc jockeys had to have them.
  https://www.facebook.com/groups/12699105116/posts/10171552941760117/