Science and technology in the United States finish. For example, the British engineer Joseph Swan built an incandescent electric lamp in 1860, almost 20 years before Edison. But Edison's light bulbs lasted much longer than Swan's, and they could be turned on and off individually, while Swan's bulbs could be used only in a system where several lights were turned on or off at the same time. Edison followed up his improvement of the light bulb with the development of electrical generating systems. Within 30 years, his inventions had introduced electric lighting into millions of homes. Another landmark application of scientific ideas to practical uses was the
Moscow Electric Lamp Plant and the Electrovacuum Instrument Plant in Voronezh. The Moscow Electrovacuum Instrument Plant, with its two associated special design bureaus, specializes in developing and producing a variety of vacuum tube products (photoelectric cells, xenon and mercury tubes, gas-filled and gas discharge devices, photoelectronic multipliers and others). This plant dates back to before World War II, and was known, until 1972, as the Moscow Electric Lamp Plant (MELZ). The Khromatron Plant in Moscow and the Electrovacuum Instrument Plant in Voronezh, produce mainly CRT's for color television. Moscow Electric Lamp Plant Moscow Electric Lamp Plant () is a company based in Moscow, Russia.