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It is this essence of the difference in inventions from innovation. The latter mean primarily market success. For example, Edison's light bulb. By the time of its patent, incandescent lamp has already existed in the market, including the Russian design A. Lodgin, but had a very limited penetration my blog. The invention of Edison was a screw cap, which allowed to make a lamp is easily replaceable and, consequently, one-time. This opened the way to a sharp increase in use by removing the main barrier to the transformation of electricity to the base method of domestic lighting. It became an economically feasible central generation of electric current - the lack of which was an important restraining factor in penetration of electrical systems. In fact, one move with the socle - did not have the slightest relation to the electrical properties of the lamp - launched the entire modern ecosystem of electricity.