This is really scary. I've taken circuit breakers apart before just to piddle with them, but I've never seen one, in service and energized, like these guys. It looks kinda like an old Trumbull, or FPE (
MDP. I don't understand why someone would remove the top cover of these breakers
I see lots of situations where the panelboard cover is either missing or not in place. Occasionally you will also find a panel with the front cover in place, but missing the dead-front. I guess it's just too much trouble sometimes...