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air slide conveyors, belt conveyor rollers, belt conveyors, screw conveyors, bucket elevators, centrifugal blowers, centrifugal fans ...more contact supplier view catalog super air control pune - , india pollution control systems, pollution control equipments, centrifugal fans, open impeller fans, tube
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american inventor lee de forest lee de forest circa – born lee deforest ( - - )august , council bluffs, iowa , u.s. died june , ( - - ) (aged ) hollywood , california , u.s. nationality american alma mater yale college ( sheffield scientific school ) occupation inventor known for three-electrode vacuum-tube
career—he boasted that he made, then lost, four fortunes. he was also involved in several major patent lawsuits, spent a substantial part of his income on legal bills, and was even tried (and acquitted) for mail fraud. his most famous invention, in , was the three-element " audion " ( triode ) vacuum tube...
https://en.wikipedia.org/wiki/Lee_de_Forest