Found in Motorola's 1965 manual, this full-wave dimmer controls a load that depends on the used SCR. The trigger element is a neon lamp.
The simplest flip-flop can be built with two NAND gates as shown here. This is a Reset-Set [S-R]...
In the figure we show a circuit that allows to obtain a signal in phase with the input and another...
We found this circuit in an old General Electric documentation. In fact, PUTs are not common...