Technology Inventions App Download | General Knowledge Notes PDF e-Book
General Knowledge Admission Tests: Practice Test 24 (Chapter 14)
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Earliest cast iron was developed in China in
In 1918, hydraulic brake which replaced mechanical brake was invented by
Primary inventor of the carbon-filament light bulb is
Toggle light switch was patented by Morris Goldberg and William John Newton in
In 1834, first combine harvester was invented by
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