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In April 1879, Edison addressed research on electricity. The competition was fierce and had patented several laboratories and their lamps. The problem was to find a material capable of maintaining a long light bulb. After testing various elements with negative results, Edison finally found carbonized bamboo filament. Immediately purchased large quantities of bamboo and displaying his pragmatism, set up a workshop for manufacturing the same bulbs. Then, to show that electric lighting was cheaper than gas, began selling their lamps to forty cents, but to manufacture it cost him more than a dollar, its aim was to increase the demand to produce them in large quantities and lower unit costs. Soon each bulb got cost him thirty-seven cents: the business began to go smoothly. In the image to the left, drawing the famous patent No. 223,898. On the right, one of the first bulbs produced, utilitzada in a demonstration at the Menlo Park laboratory, during Christmas of 1879.