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2. Wedge base - Wikipedia

   en.wikipedia.org/wiki/Wedge_base

   (The wedge bases are now usually not even supplied with the bulbs, which cost nearly as much as buying a new set, typically 10 bulbs for a dollar but a new set of 100 for two dollars.) Modern sets typically have a long and thin wedge that extends all the way down to the back end of the socket, separating the two electrical conductors and ...

3. Extension cord - Wikipedia

   en.wikipedia.org/wiki/Extension_cord

   Yellow NEMA 5-15 extension cord NEMA-1 extension cord, common in the United States Extension cord reel (Germany). An extension cord (US), extension cable, power extender, drop cord, or extension lead (UK) is a length of flexible electrical power cable (flex) with a plug on one end and one or more sockets on the other end (usually of the same type as the plug).

4. Crossbar switch - Wikipedia

   en.wikipedia.org/wiki/Crossbar_switch

   A crossbar switch is an assembly of individual switches between a set of inputs and a set of outputs. The switches are arranged in a matrix. If the crossbar switch has M inputs and N outputs, then a crossbar has a matrix with M × N cross-points or places where connections can be made. At each crosspoint is a switch; when closed, it connects ...

5. Coaxial power connector - Wikipedia

   en.wikipedia.org/wiki/Coaxial_power_connector

   The Japanese trade organization EIAJ issued EIAJ RC-5320A, which defines five plug and matching socket or jack sizes. Each of these plugs is used with a specified voltage range. Most manufacturers use colored insulating materials to distinguish these plugs from other similar-looking DC plugs, and for quick identification between EIAJ plugs of ...

6. Number One Crossbar Switching System - Wikipedia

   en.wikipedia.org/wiki/Number_One_Crossbar...

   Earlier crossbar exchanges had used the crossbar switch according to the selector principle, with one input and typically 100 or 200 outputs, similar to a stepping switch. The No. 1 Crossbar pioneered the link principle, with each individual switch able to handle as many phone calls as it had inputs or outputs, typically ten.

7. Pull switch - Wikipedia

   en.wikipedia.org/wiki/Pull_switch

   The most common use of a pull switch is to operate a ceiling electric light.The ceiling fan and mechanical wall fans are also appliances often operated by pull switches. . Pull switches may be either two-position (open or closed) or multi-position (allowing for different fan speeds or levels of illuminati