Certainly, it was and is very necessary to use extreme caution working around such machinery, and most especially back in the day when those belts could also pull you into a pulley with irresistible force, much to your detriment!
I know my Lady has a finger that doesn't work so well any more, but she is very lucky to still have it, along with the rest of her hand, because she was wrongly wearing gloves while operating a Drill/Mill set-up as a second operation, while running an injection molding machine, hence the gloves. But those two production operations should not have been attempted side by side, and her finger paid the price by the glove getting snagged by the bit and wrapping her finger up around the base of the chuck!
OUCH!!!
Death and dismemberment awaited any who worked in such a shop as is pictured, even without the belts and shafting. It was, is and always will be very necessary to keep your wits about you at all times in such an environment!!!