The hand-held hair dryer is a not such a recent invention.
The earliest models were on the market in the US in 1915 but had an unfortunate habit of either overheating and burning out, or electrocuting people. Metal, weighing in at two kilos and only being able to deliver 100w of power (instead of today’s 2000w) meant that beauty really was painful.
It wasn’t until the 1970’s when more high-grade, heat resistant plastics were in use and all the safety bugs were eliminated that the hand-held blow dryer became an item in every household.
Until then, we had hair rollers.
Plastic rollers, foam rollers, velco rollers ...