Nick is right....even with the 76, the Hamilton-Standard folks were trying to build an autopilot system that was comparable to the Sperry Kit. They were building it in phases over a period of years while the Sperry was setting on the shelf waiting to be installed. That gave rise to Heli-dyne down the road from the Bell Plant. Air Log bought the green helicopter and installed their own instrumentation and avionics to include the Sperry kit.