The modern date Sandwich maker was invented in the 1970s by John O’Brian. His company Brevillle adopted the inspiration from early Jaffles a Belguim implement for toasting over a fire or stove. The early days of toasted sandwich were very messy as the early machines could seal the sandwich and stop the extremely hot ingredients breaking in the hands of the diner. John patented the design to seal the edges resulting in the product you see today. A typical sandwich maker consists of two hot plates powered by an electrical coil. The modern design has stayed more or less true to the original models. With the addition of thermometer dials, lights to show the unit is hot enough and more lately deeper filled trays to allow more geneorous portions in the sandwichs.