a petty officer on a merchant ship who controls the work of other seamen

a pedal that controls the throttle valve

a pedal that controls the throttle valve

a pedal that controls the throttle valve

a pedal that controls the throttle valve

a pedal that controls the throttle valve

a pedal that controls the throttle valve

a pedal that controls the throttle valve

an airfoil that controls lateral motion

an airfoil that controls lateral motion