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  DSC03266.JPG - A EC-1 analog educational compter from Heathkit (1960); 9 amplifier stages driven by valves, with external components (R,C) plugged in to define the function (integrator, adder, inverter....) . More  here .                    
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A EC-1 analog educational compter from Heathkit (1960); 9 amplifier stages driven by valves, with external components (R,C) plugged in to define the function (integrator, adder, inverter....) . More here. Download
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