76.Who invented Microphone View Answer Report DiscussAnswer: GRAHAM BELL Explanation:Currently no explanation available Improve this answer lets discuss in forum
77.Who invented Maser View Answer Report DiscussAnswer: CHARLES H. TOWNES Explanation:Currently no explanation available Improve this answer lets discuss in forum
78.Who invented Liquid Oxygen View Answer Report DiscussAnswer: DEWAR Explanation:Currently no explanation available Improve this answer lets discuss in forum
79.Who invented Machine Gun View Answer Report DiscussAnswer: DR. RICHARD GATTLING Explanation:Currently no explanation available Improve this answer lets discuss in forum
80.Who invented Laws of Multiple Proportion View Answer Report DiscussAnswer: DALTON Explanation:Currently no explanation available Improve this answer lets discuss in forum
