Edison screw

The Edison screw fitting is a system of light bulb connectors, developed by Thomas Edison and licensed starting in 1909 under the Mazda trademark. Most have a right-hand threading, so that it goes in when turned clockwise and comes out when turned counterclockwise, like a hardware screw. There are rare instances where these are reversed to deter theft, so that they cannot be used in other light fixtures. The designation Exx refers to the diameter... more

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