In the episode, Wonder Woman and the Mind Maidens, the evil Medula hypnotized Wonder Woman and her friend Jayna with a will booster contraption, the premise was that the will booster would help women rule the world unopposed.
However, the price was still high for such a contraption at approximately $1,300 and the size was still an issue since the ovens were contained in units as big as a refrigerator.
The first contraption that ever toasted bread was manufactured by a company in Britain called Crompton and Company by a man named Rookes Crompton.
This allowed for the evolution of the toaster into the modern contraption with hidden heated wire components.
Contour Abs is essentially another contraption using an electric current to make your muscles contract.