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Commonly used mechanical switches on pre-built keyboards [ edit ] Manufacturers frequently build computer keyboards using switches from original equipment manufacturers (OEMs).
Mechanical keyboards (or mechanical-switch keyboards) are computer keyboards which have an individual switch for each key. The following table is a compilation list of mechanical keyboard models, brands, and series:
Unicomp Model M with removed z key. The exposed buckling spring is visible. A buckling spring is a type of keyswitch mechanism, popularized by IBM's keyboards for the PC, PC/AT, 5250/3270 terminals, PS/2, and other systems.
The IBM Model M is a large family of computer keyboards created by IBM that began in late 1983 when IBM patented a membrane buckling spring key-switch design. The main intent of this design was to halve the production cost of the Model F. [ 13 ] The most well known full-size Model M is known officially as the IBM Enhanced Keyboard.
Castle clock, 1206 – Al-Jazari's castle clock, a hydropowered mechanical astronomical clock, has been described as the earliest programmable analog computer. [6] [7] [8] The Astrarium was a complex astronomical clock built in 1348 by Giovanni Dondi dell'Orologio. The Astrarium had seven faces and 107 moving parts; it could show and predict ...
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.
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Unlike mechanical typewriters, PC keyboards do not capitalize all letters properly when both shift keys are engaged simultaneously. [citation needed] ⇪ Caps Lock selects upper case, or if shift is pressed, lower case of letters. In mechanical typewriters, it worked like the Shift key, but also used a lock to keep the Shift key depressed.