Cans had a metal strip below the top, and a key attached to the can. You fit the key into the end of the strip and turned it to remove the top. The strip was prone to breaking and an alternative was invented.
Cans had a metal strip below the top, and a key attached to the can. You fit the key into the end of the strip and turned it to remove the top. The strip was prone to breaking and an alternative was invented.