The test desk would read the capacitors on the ringers. The more ringers, the more capacitance.

I put a GTE CO into Lenox Hill Hospital in NYC. The plant was large and consisted of multiple buildings of various ages that were not interconnected on all floors. It made repair much easier to "look" at the set with the test desk. It cut back on a lot of wasted trips.

Sam


"Where are we going and why are we in this hand basket?"