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Hygrade Incandescent Lamp Company
1901 - 1931
"The Poor brothers started the Hygrade Incandescent Lamp Company in 1909 to sell new carbon-filament light bulbs and, by 1911, tungsten filament light bulbs."
This information, and much more, is found on "A Century of Illumination," Osram Sylvania, http://www.sylvania.com/en-us/about/Pages/history.aspx (accessed 01/07/2015)