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From Mylegokingdom

Many people tend to feel that containers and can openers were developed round the same time, as it has become considered necessary to have a can opener in order to open a can. This is simply not, in reality, the case: containers were invented in the early 19th century, to be able to store food for the navy, while can openers werent invented until a named Ezra Warner came up with the idea half of a decade later. Meanwhile, people had ahead up with innovative methods to open the cans, frequently using sharp knives, or a hammer and chisel.

The can opener we love and all know today dates back to 1925, though it was just a small adjustment to the original 1870 design, putting a edge to the cutting wheel. It's a testament to their power that the only change since has been the introduction of electric can openers, but electric can openers continue to be certainly not common, and it's unusual to find a kitchen that doesnt have a very can opener in the traditional style

Even though pull-to-open cans were invented 50 years ago, people still open an incredible number of cans everyday using can openers, as cans are much cheaper to produce once they dont include a ringpull. There's also a certain nostalgia benefit in opening a with a opener if you havent done it for some time if you cut your self on the sharp steel edge of the drinks top though it can also be described as a little dangerous.

However, the common wheel design isn't the only real kind of can opener around. A different one that is quite typical is the P-38 pocket could operator, found in the army and often provided with food assist in the developing world. It's much cheaper to produce than a standard can opener, as less metal is used much by it, consisting only of a metal blade with a land. For the experienced, it can even be considerably faster to use than a regular can opener, and it's truly simpler to take and store.