Furthermore, as fast as the worlds of engineering, manufacturing and component design have changed in the intervening 120+ years, o-rings have stayed more or less identical in both form and function. Some of the materials used in the manufacture of o-rings have of course become more high-tech over time, but essentially o-rings remain a beautifully straightforward and reliable solution to a problem that was first brought up more than a century ago.
http://www.yuefeng-seal.com/o-rings/
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