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These may be a form of neon regulator which strikes at a voltage somewhat higher than 70 and given sufficient current to maintain ionization, holds that regulated voltage until the anode voltage is spiked lower than the maintaining voltage. These could easily provide a self-illuminated flip flop arrangement. The regulated voltage was controlled by the gas mixture used for the fill. It is vital to provide them with a limiting resistor, without which they are likely to self-destruct.
Brian Whatcott Altus OK