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  2. Time switch - Wikipedia

    en.wikipedia.org/wiki/Time_switch

    A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer. Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall lights, stokers, and oil and gas burners." A consumer version was added in 1952.

  3. Staircase timer - Wikipedia

    en.wikipedia.org/wiki/Staircase_timer

    DIN rail mounted electronic lighting timer. An electronic timer allow simple push-buttons to be used. One timer is installed controlling the lights and any number of push-buttons, without pneumatic timers and connected in parallel, are used to trigger it. [1] [4] With many push-buttons, the cost savings for equipment may be substantial.

  4. Traffic light control and coordination - Wikipedia

    en.wikipedia.org/wiki/Traffic_light_control_and...

    Cycle lengths of signalized intersections are determined by small gears that are located within dial timers. Cycle gears, as they are commonly known, range from 35 seconds to 120 seconds. [citation needed] If a cycle gear in a dial timer results in a failure, it can be replaced with another cycle gear that would be appropriate to use. Since a ...

  5. Xiaolüren - Wikipedia

    en.wikipedia.org/wiki/Xiaolüren

    The bottom window, previously showing the walking animation, sometimes becomes a countdown display in red, although there are many versions of xiaolüren pedestrian lights where countdowns are absent and not build in to red lights, red light timers also break more easily than green light timers, as the devices are possibly programmed to believe ...

  6. History of traffic lights - Wikipedia

    en.wikipedia.org/wiki/History_of_traffic_lights

    The answer was a third light that was colored amber, which was the same color used on the railroad. [6] Potts also placed a timer with the light to help coordinate the lights. A tower was used to mount the lights as the junction at which it was installed was one of the busiest in the world, with over 20,000 vehicles a day. [3]: 35

  7. The best air purifiers of 2025 - AOL

    www.aol.com/lifestyle/best-air-purifiers...

    While pricey, and no app or remote, other features include a “replace filter” light, timer (schedule) option. Available in white or black, Airmega 200M is a solid air purifier for medium to ...

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