A multiple input, single output, mechanical actuator including a housing, an actuator rod reciprocably mounted in the housing and having one end projecting therefrom, a plurality of aligned, signal responsive elements in the housing, each independently mounted for reciprocation therein towards and away from the rod, a plurality of signal input structures in the housing, one for each of the elements, for applying a force to reciprocably move the associated element toward or away from the rod, and a plurality of aligned, interengaging links reciprocably mounted within the housing, one for each of the elements, and operatively associated with the rod, each of the links being relatively movable with respect to its element and slidable with respect thereto for one direction of movement of the element and movable therewith in the other direction of movement of its element.