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  • Yesterday The need to secure precious objects is so innate to humans and many other animals that it is not surprising the earliest locks appear as long ago as 4000 years. The oldest known locks employed a pin tumbler mechanism much like that of our modern "Yale" lock but on a far larger scale. They have been found in cultures as diverse as those of Egypt, Japan and Norway. The Romans can be credited with the invention of the metal lock and in fact developed the "warded lock" which uses the familiar ske...