Artificial light bulb
Thomas Edison is often mistaken as the inventor of the light bulb. But in fact he was the first to patent the invention of the light bulb more than 20 scientists who invented the light bulb. And can be made into a business.(General electric) large electronics company in the world. And founded several companies in the field of electricity. One of the Edison also invented the electric chair for executions as well
.Edison is still important in the current war (war of currents) by Edison DC system, pushing the company. AC power system against George Westinghouse's (george westinghouse).