7 inventions made so well that they never needed improvement 

Continuous improvement and improvement of tools and household items makes our lives easier and more convenient.
For example, if today someone tries to write with an original pen from Sholes and Glidden in 1868, then, having written a dissertation, he will cover his hands with countless corns. And if you had to open a medieval castle, then you would have been busy with it for a long time before you learned how to make the key a sharp blow, which was simply necessary for opening.
However, paradoxically, at present there are a number of things that, despite the fact that more than a century has passed since their invention, are still preserved in their original form without improvements.
Bubble wrap
In the late 1950s, designers Alfred Fielding and Mark Chavannes came up with a brilliant idea, ideally suited for the aesthetic design of the space-age space: cellophane tactile volumetric wallpaper! Unfortunately, plastic curtains with air bubbles never became fashionable. Then the innovators decided to simply change the purpose of the invention. In 1964, they patented their own “method of manufacturing laminated cushioning material.” Thus, bubble packaging (in English – bubble wrap) has become an ideal way to preserve fragile and especially valuable items during transportation. Such packaging has been widely used due to its practicality and low cost.
Rocking chair
The rocking chair is not as old as you think. These chairs began to appear at the beginning of the XVIII century in the United States and are still popular with people suffering from diseases of the back or musculoskeletal system. After all, this is not just a soothing rocking. Rocking chairs automatically adjust their center of balance, so that the one who sits in them, each time occupies a comfortable position.
The thin wire constructions that flooded the patent offices at the end of the 19th century were of various forms – in the form of wings, triangles, pretzels, and so on, but their purpose was the same: to hold a certain number of sheets of paper. All of them were patented, except for the form to which we are accustomed for 100 years. The standard oblong design “Pearl”, having a controversial origin, nevertheless won all the others, throwing them into the box of history.
Archaeologists believe that the kettles were invented during the reign of the Chinese Yuan dynasty, which began in 1279. The first kettles were made of clay and probably changed over the years. It is believed that the kettles were originally designed for one serving – this is how the purpose of the spout is deciphered, right from which the drinker sipped the tea. Today you can buy a teapot made of porcelain, glass, paper or titanium. But its simple and perfect design, consisting of a pen, a cap and a spout, has remained unchanged for hundreds of years.
Fly swatter
Handle and a small dense mesh on the end. This is a primitive, but effective device in almost every home, and it is indispensable in the summer months to fight flies, mosquitoes and wasps. The Killer on the Fly was patented in 1900 by Robert Montgomery . This man was a government medical worker in Kansas and popularized his invention on the destruction of flies to stop the spread of disease. Oddly enough, such a primitive fly swatter turned out to be a very effective tool against evading insects.
God forbid you have mice in your home. Getting rid of them will be a real problem. And if the tenants of the house do not have a cat who is not averse to hunting mice, then mousetraps would be the best way. At one time, the mice were terrible parasites: these nosy little animals were a real threat to children and food, and they carried all sorts of diseases, including the plague. Fortunately, in 1894, William Hooker invented the spring mousetrap. And in 1903, John Mast introduced a constructive improvement, making it safer to load the bait. His mousetrap design is still used.
Barbed wire
In the XIX century in the prairies of Oklahoma it was quite difficult to make a fence to enclose a grazing site. After all, there is not enough wood to build fences. What to do? Four local guys in the late 1870s came up with the design of the fence, consisting of rare support pillars and barbed wire stretched between them. Barbed wire has been patented and has since been produced unchanged.

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