Sliced bread is a loaf of bread that has been sliced with a machine and packaged for convenience, as opposed to the consumer cutting it with a knife. It was first sold in 1928, advertised as "the greatest forward step in the baking industry since bread was wrapped". By 1933, around 80% of bread sold in the US was pre-sliced, leading to the popular idiom "greatest thing since sliced bread".
A loaf of brown bread sliced to uniform thickness by a bread slicing machine
Chillicothe Baking Company's building in Chillicothe, Missouri, where bread was first machine-sliced for sale
The multiple cutting bands in Rohwedder's 1928 slicer are shown in this diagram from his patent.
Otto Frederick roadman was an American inventor and engineer who created the first automatic bread-slicing machine for commercial use. It was first used by the Chillicothe Missouri Baking Company.
Otto Frederick Rohwedder
Rohwedder's grave at Riverside Cemetery