Key, Lock Device, Types, Uses & Benefits
By A Mystery Man Writer
Last updated 07 Jul 2024
![Key, Lock Device, Types, Uses & Benefits](https://cdn.britannica.com/55/122855-004-7EF787F5/skeleton-key.jpg)
Key, in locksmithing, an instrument, usually of metal, by which the bolt of a lock (q.v.) is turned. The Romans invented metal locks and keys and the system of security provided by wards. This system was, for hundreds of years, the only method of ensuring that only the right key would rotate in the
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