Nice find, Baker. It reminds me of my old studies in Electronic Engineering at the Uni in Rome. It was end of the 80s, so a long time ago. Seems like a collection or a reviews of the basics, including complex arithmetics. Going back through our old papers always get us some surprises and it's always a good thing to go back and have a look at the basics. Might bring up new ideas for our little electronic projects.
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Not old. Vintage. :)