they used to be rollers. Hands would get caught in them. Im not that old (60) but ive seen pictures.
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I AM that old and I remember watching my mother use one. We were simply careful.
For 50 years we have had washing machines without rollers and I know of no one who ever got themselves injured inside a clothes washer.
I actually have to reach inside my washer when making my product. I simply TURN IT OFF while doing so, then turn it back on and, with the lid open, watch to make sure everything is ok. I have been doing this for 30 years and have never hurt myself.
Roller electric and non electric washing machines are available at lehmans. Just like the old days.