Re: Unknown transistor osc.
A little bit of info on SEI here https://www.gracesguide.co.uk/Salfor...al_Instruments.
I too can think of a few locations where great engineering has been supplanted by supermarkets or similar. Plessey's Caswell Research centre seems very different now to what I recall in the 1970's http://www.caswellpark.co.uk/the-par...ers/index.html
B
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