With mechanical control systems the input is supplied by movement, this is known ... For example the pendulum in a mechanical clock.Lastly there is also reciprocating motion.

EL PASO, Texas (KVIA) -- El Pasoans Fighting Hunger Food Bank partnered with Rotary District 5520 for a volunteer service project today, April 25. The event was held from 10:00 to 11:30 AM in the ...