Tungsram is a Hungarian manufacturer of light bulbs and vacuum tubes since 1896. It is now a subsidiary of General Electric and its name is used as a brand name only.
The company was awarded a patent for electric bulbs with a tungsten filament in 1903. Later in 1934, they also announced a patent for Imre Bródy's electric bulb filled with krypton. Both provided a longer lifetime for electric bulbs.The name Tungsram is a portmanteau of "tungsten" (English pronunciation: /ˈtʌŋstən/) and "wolfram" (/ˈwʊlfrəm/), as tungsten, the metal used for making the filaments, is known in Hungarian, German and many other languagesTELEFUNKEN T 431/1 1233 CRT TUBE TUNGSRAM A31-410W