Pushwheel
Switch/Coded Switch is a setting switch that converts the numeric value
selected by turning plus and minus buttons on which numbers are written
into a binary, decimal or other code using the combination of ON and
OFF signals for multiple contact circuits and that outputs the resulting
code. They
can be on a mechanical or an electronic device. These are sometimes
called digital switches, and you can see them in action on a variety of
different devices. Some of them are very simple, while others are going
to be quite a bit more complex.
http://oceanenclosures.com/thumbwheel-switches
