dixi, don't know about later, but initial introduction saw the DAN AIR 727 fitted with stick pusher, stick nudger and stick shaker to offer full stall protection.
ATR 42 Model: 400/500 manual
A stick pusher and a stick shaker are provided, preventing the aircraft from reaching a critical angle of attack. When the detected incidence becomes too high, the MFC sends a signal to an electric actuator which shakes the control column at stall alert thresholds.If angle of attack keeps increasing, a further threshold is reached and the MFC activates the stick pusher ; the complete pitch control linkage assembly is pushed forward. Note : There are two stick shakers, one for each control column but only one stick pusher actuator located on the captain pitch channel. In case of pitch uncoupling when the pusher triggering angle of attack is reached, only the captain control column is pushed forward.