THE BASIC MODERN COMBINATION LOCK works by at aching a combination dial to a spindle that controls a series of wheels.
AI-Jazari, author of Book of Knowledge of Ingenious Mechanical Devices, provided plans for a combination lock—along with a mechanical clock powered by water and weights—in 1205 A.D. But German inventor Joseph Lo-ch is usually cited as the man who crafted the first modern iteration for Tiffany & Co., which had plenty worth locking up.
When the notches in each wheel line up with the others, the bolt that secures the lock is released.
Top 10 MIXMASTER MODERN COMBINATION LOCK