1930s flapper bob perm hair curlers, water waver clip rods for permanent wave hair

Lot of 'Water Waver' and other similar hair clips for short waved bob hair style permanents? It looks as though a clip would be the whole length of the side of the head, so 4-6 clips for a hair-do? We haven't been able to find out very much info about these, I guess they're a little hard to find!