GEM (General Electric Metallized) Lamp Advertisement
This advertisement for Meridian lamps (having carbon filaments coated with pyrolytic graphite) shows the patents under which the lamp was manufactured. For example, No. 516,800 was issued to Henry Burnett and Samuel Doane, No. 532,760 was issued to Mark Branin, No. 537,693 was issued to Arturo Malignani, and No. 726,293 was issued to John Howell.