IBM 5100 computer
These are hairdryers. They consist of an electric heating element, and a fan blower. The fan blows or draws the outside air over the coils and then blows it out to the hair to dry it. The one on the right was a handheld model that you pointed the nozzle to the hair, and the one on the left is a bonnet or cap model where you put the elasticized cap on the head to dry the hair.