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Inventions have been made starting from the stone age till now. Inventions have played a definite role in human history. It has transformed human being in many ways. Since necessity is the mother of invention, we keep inventing for the time to come. It is the fact that the invention were made to prove the military muscle power of the  group or state. Subsequently this innovation has been utilized for civil use. Since beginning of this century, invention in the field science and technology has taken a leap. Invention of digital computer has been the greatest invention of all time. It has not only made man-machine work efficiently but has enhanced productivity. It has made world a global village, we can link and connect to large information. We can literally travel at the speed of thought and connect to any place of world.
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