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  2. 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 ...

  3. Railway signal - Wikipedia

    en.wikipedia.org/wiki/Railway_signal

    Some signals convey large amounts of information. This older German signal indicates preliminary caution with max. 60 km/h in the upper main signal aspect (green above yellow, number plate "6") and caution in the lower distant aspect. The lower yellow number indicator announces a speed limit of 30 km/h by displaying "3".

  4. List of keyboard switches - Wikipedia

    en.wikipedia.org/wiki/List_of_keyboard_switches

    3.6 mm Plate Mounting No Yes 80 million Kailh Kailh BOX Noble Yellow MX Type stem Clicky Click Bar 65 g 65 g 65 g 1.8 mm 3.6 mm Plate Mounting No Yes 80 million Kailh Kailh BOX Pinks MX Type stem Clicky Click Bar 65 g 65 g 65 g 1.8 mm 3.6 mm Plate Mounting No Yes 80 million Gateron Gateron Aliaz Silent MX Type Stem Silent Tactile N/A

  5. North American railroad signals - Wikipedia

    en.wikipedia.org/wiki/North_American_railroad...

    Vertical color light signals are the second major pattern of color light signals, and today represent the most popular form of signal in North America, supplanting the searchlight. [ citation needed ] These signals are not different from the triangular type color signal in function, but present a much altered visual appearance.

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. DIN 72552 - Wikipedia

    en.wikipedia.org/wiki/DIN_72552

    1, 3, 54d, S 53a limit stop + 54, +2 53b limit stop field 3, 54e 53c washer pump 53e stop field 1, 2 53i wiper motor with permanent magnet, third brush for high speed Acoustic warning 71 beeper in H 71a beeper out, low 71b beeper out, high 72 hazard lights switch 85c hazard sound on Switches 81 opener 81a 1 out 81b 2 out 82 lock in 82a 1st out 82b