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Who invented the Refrigerator?
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Which company is ahead in Locomotive innovations?
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Which company is ahead in Autogiro innovations?
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What year was Autogiro invented and how?
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Who invented the Stirrups (metal)?
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What year was Cement invented and how?
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Which company is ahead in Machine Gun innovations?
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When and who invented the X-ray?
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What year was Arc Lamp invented and how?
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Who invented the Telescope (1st refracting)?
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When and who invented the Electric Generation (Static)?
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