Science is advancing our understanding of the human body (photo taken at the Wellcome Centre, London) —Image by © Tim Sandle Science is advancing our understanding ...
Marked: "The Grewal Mfg. Co. / Newark, N.J. / Pat. Pend." A crystal detector with induction coil and slider. Detector is fixed type, and has one lead to a .0005 mfd. bypass capacitor which offers a ...
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