Packaging of foods in cans is practiced for a number of years older than the invention of the opener of a good deal. The first boxes were invented in Holland and boating regulations in iron boxes were filled with tin. Once sealed, it was actually very difficult to open them, and also the instructions you can say about this, "at the top near the outer edge with a chisel and hammer cut". These doses were very robust container and weighed many times more than the content itself. Thiswere known to be used at least since 1772. However, it was not until 1855 that the first can opener was invented.
The first hole was a little over a knife with a lever that worked against the edge of the can. These were built in a very simple and in fact are still in use as a manual can opener easy. In fact, we can leverage this kind opened in key-chains, pocket knives, etc., even now.
Variations of the same basic model has been successfully introduced and bothand failed. The second distinct type can opener was invented and patented type of spinning wheel in 1870. The original design was not very successful because they have a long lever, which can be the center of the above had to be broken, and had a spinning wheel, which are operated by hand, so they had to cut. This species was not very successful and would remain on track, they would not upgrade to the design, the two wheels that keep the user, the opener is activatednear the edge. This design was so successful that it is still in regular use today.
After this, a number of other structures, in particular the electric can opener, came up and were met with varying success. In 1930, the type of bunker opener, that taking some kind of clamp, which held both the rank and were cut along the edge was invented. This model forms the basis for all other open today. It 'only a small changeDouble wheel was the opener, but easier to use and was therefore preferred for everyday use.
Today there are many more different types available, from "cover" with the One Touch can opener, the Jar Openers, that the lid can be opened by almost any type. All of them are efficient because they all use the same principle, it's just your preference on what type you prefer.
