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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. 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.

4. Rotary combination lock - Wikipedia

   en.wikipedia.org/wiki/Rotary_combination_lock

   Many combination locks have three wheels, but the lock may be equipped with additional wheels, each with a drive pin and fly, in a similar manner. The number of wheels in the mechanism determines the number of specific dial positions that must be entered to open the lock, so a three-sequence combination is required for a three-wheel lock.

5. Mul-T-Lock - Wikipedia

   en.wikipedia.org/wiki/Mul-T-Lock

   Mul-T-Lock is an Israeli company that develops and sells padlocks, combination locks, and related security products. It was founded in 1973 by Moshe Dolev and Avraham Bahry [1] and is a subsidiary of Assa Abloy. Four years later, in 1977, Mul-T-Lock introduced the telescopic pin technology and entered the cylinders market.

6. Smart lock - Wikipedia

   en.wikipedia.org/wiki/Smart_lock

   A smart lock is an electromechanical lock that is designed to perform locking and unlocking operations on a door when it receives a prompt via an electronic keypad, biometric sensor, access card, Bluetooth, or Wi-FI from a registered mobile device. These locks are called smart locks because they use advanced technology and Internet ...

7. Real-estate lock box - Wikipedia

   en.wikipedia.org/wiki/Real-estate_lock_box

   A realtor lock box hanging on the doorknob of a house for sale. A real-estate lock box is a padlock-shaped box that generally hangs around the doorknob of a house that is on the market. The device holds the keys to a house to allow communal access for all real estate agents, while continuing to keep them secure. [1]