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* invented the two-way television telephone or videophone (1955) patented as a "photo phone signal separator network" * discovered the physical law of electrical kinetic resistance called the Zara effect (around 1930) * invented an airplane engine that ran on plain alcohol as fuel (1952) * improved methods of producing solar energy including creating new designs for a solar water heater (SolarSorber), a sun stove, and a solar battery (1960s) * invented a propeller-cutting machine (1952)

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16y ago

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