Canned food was invented in 1810 in order to supply Napoleon's army. The modern version of the can opener was invented 60 years later.
The Saxophone was invented by Adolphe Sax in the 1840s. He didn't gain much monetary compensation for his invention, and had to fight numerous attempts to copy his patent and even an attempt on his life.
The only museum dedicated to potato fries is the Friet museum in the city of Bruges, Belgium. Legend has it that Belgian fishermen used to eat small fried fish and in the winter and they cut potatoes in the shape of small fish to fry them.