Micro switch
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A micro switch is a generic term used to refer to an electric switch that is designed to be actuated by the physical motion of mechanical devices and is generally packaged in a small form factor to allow placement in small spaces. They are very common due to their low cost and extreme durability, typically greater than 1 million cycles and up to 10 million cycles for heavy duty models. This durability is a natural consequence of the design. Internally a stiff metal strip must be bent to activate the switch. This produces a very distinctive clicking sound and a very crisp feel. When pressure is removed the metal strip springs back to its original state. Common applications of micro switches include computer mice buttons and arcade game's joysticks and buttons.
The first micro switch was invented by Peter McGall in 1932 in Freeport, IL. McGall was an employee of the Burgess Battery Company at the time. In 1937 he started the company MICRO SWITCH which still exists as of 2005.