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inventors list

ssc preparation, important competetion questions, current affairs of india, latest question asked in competetion papers, 21. Who invented Electron ? Thomson. J of Britain in 1897  Comment on this question 22. Who invented Floppy disk ? IBM in 1970  Comment on this question 23. Who invented Neutron ? JAMES CHADWICK in 1932  Comment on this question 24. Who invented Refrigerator ? Oliver Evans in 1805  Comment on this question 25. Who invented Safety Pin ? Walter Hunt of U.S.A. in 1849  Comment on this question 26. Who invented Safety razor ? King Camp Gillette of U.S.A. in 1903  Comment on this question 27. Who invented Stainless Steel ? Harry Brearley of Britain in 1913.  Comment on this question 28. Who invented Steam Engine ? Thomas Savery of Britain in 1698  Comment on this question 29. W...

inventors and invention

ssc preparation, important competetion questions, current affairs of india, latest question asked in competetion papers, GK Questions - Important Inventions 1. Who invented Aeroplane Orville & Wilbur Wright in 1903  Comment on this question 2. Who invented Air Conditioning ? Willis Carrier in 1902  Comment on this question 3. Who invented Barometer ? Evangelista Torricelli of Italy in 1644  Comment on this question 4. Who invented Ball-Point Pen ? John J. Loud of U.S.A. in 1888  Comment on this question 5. Who invented DNA Structure ? Crick(UK), Waston(US), Wilkins(UK) in 1951  Comment on this question 6. Who invented Laser ? Charles H. Townes  Comment on this question 7. Who invented Locomotive ? George Stephenson was first to buit steam locomotives.  Comment on this question 8. Who invented Logarithms ?...