That's it. Besides Melco, Teltone and a couple of other folks made them, they worked fine. I still have one working in the house and use it every day.
You could also get a 207C (9 station rotary selector Intercom), a 216 (9 station expander) and a 247 unit. Wire them together and you'd get the same result as the Melco. (The first two were wire spring relay units and the third was PCBs). I don't think I've seen one of them in 30 years.
Sam
