Q. Porcelain was manufactured in northern China in

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Q. Printing press was invented by

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Q. Printing Press was invented in

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Q. The Rotary Printing Press was invented by 'Richard March Hoe' in

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Q. The Rotary Printing Press was invented by

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Q. World's first printing press was invented and developed in

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Q. Pulp paper making process was invented in

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Q. Railroad locomotive was invented in

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Q. Railroad locomotive was invented by

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Q. Richard Trevithick invented railway steam locomotive in

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Q. Who is known as 'Father Of Refrigeration'?

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Q. Vapor compression refrigeration machine was invented by Oliver Evans in

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Q. World's first refrigerator was invented by

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Q. Inventor who modified the design of vapor compression refrigeration machine invented by Oliver Evans to invent first refrigerator is

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Q. In 1914, first regenerative circuit was invented and patented by

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Q. First regenerative circuit was invented in

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Q. Type of resistor with electrical resistance is invented by

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Q. Steam engine was invented in

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Q. First steam engine builds to pump water by Thomas Newcomen in

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Q. A steam shovel is a machine designed for moving and lifting material in mining industry such as rock and soil is invented in 1835 by

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