Emergency HT
OK, got a little better look at one while watching an episode on Hulu.com (great site for old TV shows!). I have to amend my earlier reply. They appear to be either an RCA Personalfone (or one of its variants private labeled for Repco or Federal Signal) or possibly GE Prog Line. Can't really tell for sure, since they carry them in cases. I'm strictly going by the layout of the controls on the top of the radio. I also noted in the same episode, there is a GE MASTR II control head on the dash of the engine and a GE microphone hanging on the dash of the rescue. Yes, I know. They always showed a Mocom head and speaker in the squad. Guess it just depended on what the prop guy had handy that day.
Larry