it.

Drills and levers

In ancient Rome, there were two kinds of surgical drills. One type was driven by a leather cord, the other type used a guard and a collar. This was designed to stop the instrument from penetrating too deeply into the bone. It was thought that this would minimize the risk of damage to the brain and meninges. Drills would also be frequently dipped in water to reduce heat, which was supposed to limit the

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