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An example (open and closed) of a typical gun safe. A gun safe is a safe designed for storing one or more firearms and/or ammunitions.Gun safes are primarily used to prevent access by unauthorized or unqualified persons (such as children), for burglary protection and, in more capable safes, to protect the contents from damage by flood, fire or other natural disasters.
Sargent & Greenleaf, Inc., more commonly known among Safe and Vault technician circles as S&G, is a U.S. company that manufactures combination locks, key-operated safe and safe deposit box locks, high security military padlocks, and associated equipment.
Boxlock actions have the advantage that they are more compact than side mounted lock mechanisms, which made them a popular choice for pocket pistols. The compact design also made them well suited for pistols with multiple barrels and pepperbox pistols. The lockwork is also enclosed within the box, which protects the lockwork from dirt and damage.
Firearms with the ability to allow the user to select various fire modes may have separate switches for safety and for mode selection (e.g. Thompson submachine gun) or may have the safety integrated with the mode selector as a fire selector with positions from safe to semi-automatic to full-automatic fire (e.g. M16 rifle).
He worked as a Bank Vault Engineer for John M. Mossman from 1900-1904 where he designed the Maiden Lane Safe Deposit Company vault among others. Frederick S. Holmes started his company of the same name in 1901 and by 1910 was designing jamb-controlled vaults for which he was known.
The combinations for some electronic locks can be retrieved by examining electromagnetic emissions coming from the lock. Because of this, many safe locks used to protect critical infrastructure are tested and certified to resist TEMPEST attacks. These include the Kaba Mas X-10 and S&G 2740B, which are FF-L-2740B compliant.