I have a small collection of antique electric fans. The earliest electric fans had exposed power terminals on the back of the housing. The cages on these fans are all open more than wide enough for one to stick their fingers into the path of the blade. With the very early fans, you had a choice of chopping off your fingers or electrocuting yourself. A friend of mine once asked me how people used those fans back in the day without losing fingers. I told him that fingers were much stringer back then.
Larry