Re: BRY39 - Solid state switch's.
I remember them.... they were one of the 'odd' semiconductor devices [along with Unijunctions, and a strange combination of a heating-element and a semiconductor impregnated with a Platinum catalyst that served to detect combustible gases] that emerged in the 1960s but never really found a place for themselves and faded into obscurity.
Same could be said for the 1950s "symmetrical" junction-transistor [whose emitter and collector could be interchanged].
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