The Pop Top Can

Here's a link to an interesting article about the inventor of the pop top can, which we are all very familiar with. In part, the article states:

Their first customer, Pittsburgh Brewing Co., maker of Iron City Beer, ordered 100,000 can ends in 1962. Iron City's sales soared 400 percent in the next six months, recalled Terry Fraze, former chairman of his father's company. Beer and beverage makers started beating a path to Dayton.

Bartenders hated the sharp edges of the earliest version, according to Terry Fraze, and inverted the cans to open them with traditional "church key" openers. In 1965, his father came up with a ring-pull version that caused less bloodshed. Next came one with a dimpled ring to prevent its use to jam parking meters and, in the '70s, a now-mandatory nonremovable ring, which reduced litter.