The first automatic bread slicer was built in 1912 by Otto Frederick Rohwedder of Davenport, Iowa. However, Rohwedder was unable to attract any interest in his invention and his blueprints and prototype were destroyed in a fire in 1917.
The main problem was that the sliced bread became stale more quickly than whole loaves. It wasn’t until 1927 that Rohwedder solved the staleness problem by wrapping the thinly sliced loaves in wax paper immediately after slicing.
He then re-build his machine and advertised it as “the greatest forward step in the baking industry since bread was wrapped”.