I noticed a metal buttons on jeans pockets? Do you know her secret?

When buying presses jeans care for some of the things done, such as the color and the severity and form in general, and already we note that the metal buttons on the pockets, which does not take her not often, and we think that it is unnecessary, and overlook them.
So what is the secret behind the existence of such metal buttons on the edges of the pockets of jeans?

Well, in fact, these buttons are not placed on the futility of the pockets of jeans.

As the old jeans was common among residents of the working class who work hard physical. During that time, they were suffering from separation and rupture pockets while you work, and this was a problem for them, because they were in need of those pockets.
This problem persists even Khayat Jacob Davis, a local customers for the company Levi Strauss came, ingenious idea in 1873, which would have solved that problem completely. Eventually considered a stroke of genius.
The Davis as he put copper fasteners such as buttons on the edges of pockets to keep it from separation from the jeans.
Davis wanted to get a patent for this idea, but did not have enough money. Therefore, the Levi Strauss SA offered him a deal to get this patent.
Those buttons metal continued pockets of jeans to this day.

Also, if you are wondering about the reason behind the existence of one of the small pocket in the front pockets of jeans, you can know from here, "Do you know the little secret of the jeans pocket?"