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2. Combination lock - Wikipedia

   en.wikipedia.org/wiki/Combination_lock

   A Wordlock letter combination lock.. A combination lock is a type of locking device in which a sequence of symbols, usually numbers, is used to open the lock. The sequence may be entered using a single rotating dial which interacts with several discs or cams, by using a set of several rotating discs with inscribed symbols which directly interact with the locking mechanism, or through an ...

3. Rotary combination lock - Wikipedia

   en.wikipedia.org/wiki/Rotary_combination_lock

   The outer layers, known as the wheel case, contain the gate and surround the externally-toothed wheel center, change key cam, and lever arms. When a change key is inserted into the lock mechanism, it forces apart the lever arms, which then permits the wheel center to rotate freely. This in turn allows the owner to set a custom combination.

4. Time-delay combination locks - Wikipedia

   en.wikipedia.org/wiki/Time-delay_combination_locks

   Modern time delay combination locks can have many functions such as multiple different codes, pre-set time lock settings (open and close times), pre-set vacation times (e.g. Christmas Day), dual code facility, and a full audit trail providing a detailed record of the lock history showing who opened the lock, when and how long it was open. [3] [4]

5. Padlock - Wikipedia

   en.wikipedia.org/wiki/Padlock

   A combination padlock. Combination locks do not use keys. Instead, the lock opens when its wheels are lined up correctly to display the correct combination. A padlock was invented by John I. W. Carlson in 1931 (a patent was granted in November 1934) that has both a combination on one side and a key on the other.

6. Safe-cracking - Wikipedia

   en.wikipedia.org/wiki/Safe-cracking

   Lockmasters, Inc. markets the QX3 Combi Autodialer (LKMCOMBI) that works on a variety of 3 and 4 Wheel combination safe locks. [8] Another computer-aided method uses tools similar to autodialers, which instead make measurements of the internal components of the lock then deduce the combination in a way similar to that of a human safe cracker.

7. Master keying - Wikipedia

   en.wikipedia.org/wiki/Master_keying

   The differences are in the locks the key will operate. These master-keyed locks are configured to operate with two, or more, different keys: one specific to each lock (the change key), which cannot operate any of the others in the set, and the master key, which operates all the locks in the set. [1] Locks that have master keys have a second set ...