Editing Electromechanical sensor

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Douglas Engelbart's patent for the computer mouse, [http://www.google.com/patents/US3541541 US patent 3541541], suggested several types of electromechanical sensor; which one was selected by the version built by Bill English, does not seem to be known.

The sensors used in early mice are not well-documented. The 1984 Macintosh 128K mouse used the familiar [[opto-mechanical sensor]].<ref name="128K" />

Even after this point, at least one mouse was made with electromechanical sensors.

See: [[:Category:Electromechanical mice|Electromechanical mice]]

==Gallery==
<gallery widths=250 heights=187>
File:Key Tronic pro mouse -- rotary encoder, opened.jpg | Alps electromechanical [[rotary encoder]] in a [[Key Tronic Professional Series Mouse]]
</gallery>

==References==
<references>
<ref name="128K">iFixit — [http://www.ifixit.com/Teardown/Macintosh+128K+Teardown/21422 Macintosh 128K Teardown]</ref>
</references>

[[Category:Pointing device terms]]