Logic control with test mode for fast-acting safety system...
3540338 CUTOFF MACHINE 1970-11-17 McEwan et al. 3512440 BRAKING DEVICE FOR THE LOAD-CONTROLLED BRAKING OF A DRIVEN,ROTATING COMPONENT 1970-05-19 Frydmann 3456696 PORTABLE CIRCULAR SAW 1969-07-22 Gregory et al.