Re: What are these devices?
I seem to remember that TI (Bedford) were making power silicon-diffused mesa transistors for use in TV line output stages (e.g. BUY69A) and if I remember correctly they were making experimental parts, hence the unusual number, with a higher breakdown voltage for use in a sequential-colour (10kV for orange/16kV for red) radar display. If the base and emitter terminals have more than the usual glass insulation around them it could be one of these. The other giveaway is a very low current gain ~less than 5 at 1A. The numbers either side of the logo form the date code as mentioned.
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