When Jacob Davis contacted Levi Strauss regarding acquiring a patent for his new invention he didn't invent jeans. His invention was merely, that he had reinforced a pair of pants with copper rivets. This of course made a huge difference for the common working man, who stuffed the pockets of his pants with rocks and what not to the point of actually breaking the pockets. The demand for riveted pants grew and grew and Levi Strauss with a proposition of a partnership and the rest is what we say, history. The birth of blue jeans or waist dungarees, as they were called back then, was a reality.
Up until 1937 the rivets on all stress points were all exposed. This caused for a lot of distress among cowboys and housewives alike. The rivets would simply scratch the surface of the saddles, as well as the living room furniture. This led to another invention, the hidden rivet.
The hidden rivet on the back pocket was finally replaced by a simple bar tack in the 1960's. Bar tacking is cheaper, less labour intensive and finally the hidden rivet solution was only temporary, as the rivet would wear through the protective layers of denim, and scratch saddles and chairs alike.