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2. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   A "4-way" (intermediate) switch is a purpose built double pole, double throw (DPDT) switch, internally wired in manufacture to reverse the connections between the input and output and having only four external terminals. This switch has two pairs of "traveler" terminals that it connects either straight through, or crossed over (transposed, or ...

3. Switch - Wikipedia

   en.wikipedia.org/wiki/Switch

   A toggle DIP switch with four inputs and outputs Bank of toggle switches on a Data General Nova minicomputer front panel Toggle switches with the shared cover preventing certain forbidden combinations. A toggle switch or tumbler switch is a class of electrical switches that are manually actuated by a mechanical lever, handle, or rocking mechanism.

4. Railroad switch - Wikipedia

   en.wikipedia.org/wiki/Railroad_switch

   A double switch, or double slip—the points are set to connect the upper left and lower right tracks. A double slip switch (double slip) is a narrow-angled diagonal flat crossing of two lines combined with four pairs of points in such a way as to allow vehicles to change from one straight track to the other, alternatively to going straight ...

5. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   A toggle light switch Internal components of a toggle switch. The toggle mechanism provides "snap-action" through the use of an "over-center" geometry. The design was patented in 1916 by William J. Newton and Morris Goldberg. [2] The switch actuator does not control the contacts directly, but through an intermediate arrangement of springs and ...

6. 3-way lamp - Wikipedia

   en.wikipedia.org/wiki/3-way_lamp

   A 3-way lamp, also known as a tri-light, is a lamp that uses a 3-way light bulb to produce three levels of light in a low-medium-high configuration. A 3-way lamp requires a 3-way bulb and socket, and a 3-way switch. In 3-way incandescent light bulbs, each of the filaments operates at full voltage. Lamp bulbs with dual carbon filaments were ...

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