Edison screw
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Edison screw is a standard lightbulb socket for electric light bulbs. It was developed by Thomas Edison, patented in 1881, and was licensed in 1909 under General Electric's Mazda trademark. The bulbs
230/240-volt incandescent light bulb with E27 screw base
Three-way E26d light socket
E26 Edison screw to NEMA 1-15 adapter
From left to right: E27, E14, and E10 bulbs
Mazda (light bulb)
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Mazda was a trademarked name registered by General Electric in 1909 for incandescent light bulbs. The name was used from 1909 to 1945 in the United States by GE and Westinghouse. Mazda brand light bul
Edison screw
…socket for electric light bulbs. It was developed by Thomas Edison (1847–1931), patented in 1881, and was licensed in 1909 under General Electric's Mazda trademark. The bulbs have right-hand threaded metal bases (caps) which screw into matching threaded sockets (lamp holders). For bulbs powered by AC…
Edison Mazda light bulb tester, logo by Maxfield Parrish, at the Corning Museum of Glass
Ad for the Mazda service mark, 1917.