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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Q. Inventor who invented first hand-cranked ice-cream churn and patented invention but lack resources to make and market churn is

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Q. Telephone is invented by

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Q. Telephone was invented in

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Q. Thermistor was invented in

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Q. Toggle light switch was patented by Morris Goldberg and William John Newton in

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Q. Transistors was invented by

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Q. Who invented Insulin ?

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Q. Who invented X-Ray ?

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Q. Who invented Chloroform ?

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Q. Who invented Crescograph ?

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Q. Who invented Thermometer ?

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