Lock & Key Invented In 4000 BCE?!

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If you think about the oldest lock and key without having seen any pictures of it, you might think it’s a very simple system. But you would be wrong as this system is actually very advanced and honestly it looks really sophisticated.
Its been proposed that this oldest known lock and key system was invented in Mesopotamia.
At the ruins of Nineveh they discovered the earliest known lock and key system dating from 4000 BCE, it was a wooden pin lock, which is a predecessor of the pin-tumbler lock. Become a
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