17 scientific INVENTIONS AND INVENTORS_PART-I_बैग्नानिक अबिष्कार एबं आबिस्कर्ता

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SCIENTIFIC DISCOVERIES: This video is about information and detailed description and some images of few inventions and inventors like ammeter, barometer, colorimetre, ECG, anemometer, and so many. this one is essencial for general knowledge, gk, common awareness and also very much important for all the compeetitive exams, job exam and interview preparation. mainly for railway and other central job exams
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