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Period: to
20th Century
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Wright's aeroplanes
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Radar
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Hearing Aid
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Liquid Fueled Rocket
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Warner Bros' "Talkies"
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First Differential Analyzing Computer
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Electron Mocroscope
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Nuclear Reactor
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Atomic Bomb
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Holography
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Fiber Optics
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Laser
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Compact Disc
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Betamax and VHS
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Apple Personal Computer
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Dolly the Cloned Sheep