When was the mushroom anchor, featuring a flattened stone with a hole and an eyebolt for tripping, developed?

Answer

By 400 B.C.

A significant milestone in anchor evolution occurred by 400 B.C. with the invention of the mushroom anchor, which was designed as a shaped object capable of active engagement and disengagement from the seabed.

When was the mushroom anchor, featuring a flattened stone with a hole and an eyebolt for tripping, developed?
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