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For sale is a Weston Model 750 DC Tachometer Generator. See picture of the data plate for details. I TESTED it by connecting it momentarily to my DC power supply, it did spin. (I realize that it is meant to be used as a generator, to make electricity from mechanical rotational energy, but this test shows that it is not dead). Surplus from a leading government sponsored lab. Your tax dollars at work. I do not think that it was ever used or even mounted anywhere.
