Q. John Froelich invented first gasoline-powered tractor in

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Q. The first graphical user interface was popularized as

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Q. First graphical user interface was introduced in

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Q. Gun powder was invented in

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Q. Gun powder was invented in

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Q. First headset was invented by Nathaniel Baldwin in

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Q. Hydraulic fracturing technology was invented by

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Q. In 1918, hydraulic brake which replaced mechanical brake was invented by

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Q. Nancy Johnson invented hand-cranked ice cream churn in

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Q. First test on working television system was perfomed in

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Q. Who proposed the 'Kite' experiment

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Q. Microcomputer 'MITS' Altair 8800 was designed in

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Q. World's first mechanical air conditioner was invented in

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Q. First machine gun named 'Maxim Gun' was invented in

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Q. First lock-stitch sewing machine was invented by

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Q. In 1642, first mechanical calculator was built by

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Q. In 1895, the Olympic sport, Volleyball, was invented by

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Q. John Lawrence Smith invented inverted microscope in

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Q. Land mines were invented in the

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Q. Song Dynasty China used mines in

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