Vintage curling irons!

A friend of mine, her mum owns an antiques shop. She told me a while back that her mum was closing the shop and where selling out almost everything. A few weeks after that I got a text message if I wanted to buy some vintage curling irons for almost no money. Of course! i said, thinking it was maybe 2 or three parts of an old set. I was wrong. This is what I got!

Im not sure how old they are, but they got electrical warmers so I would guess maybe 30s or 40s? Anyone who knows anything about these sort of things? 

I paid about 10-15 euros for them.

They are a bit rusty but not too bad so I think they will be easy to clean, and I am going to try the electrical parts as well and if they don't work I'll try to restore them.