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2. Vandal-resistant switch - Wikipedia

   en.wikipedia.org/wiki/Vandal-resistant_switch

   The switches are at the rear of the unit; only LED lights are on the front of the panel. When the unit is rack-mounted into a wall or rack unit, this means that only official personnel (who are able to access the back of the panel) can change the settings or use the unit. Another variant on this design is to cover the switches with a locked panel.

3. Key switch - Wikipedia

   en.wikipedia.org/wiki/Key_switch

   A key switch (sometimes called a keyswitch or lock switch) is a key-operated switch. [1] Key switches are used in situations where access to the switch's functions needs to be restricted. [2] [3] Key switches are available as components with solder connections, and are available with a variety of ampere ratings. They may use tubular or other ...

4. Panel switch - Wikipedia

   en.wikipedia.org/wiki/Panel_switch

   The panel switch is an example of a power drive system, in that it used 1/16 horsepower motors to drive the selectors vertically to hunt for the desired connection, and back down again when the call was completed. In contrast, Strowger or crossbar systems used individual electromagnets for operation, and in their case the power available from ...

5. 1A2 Key Telephone System - Wikipedia

   en.wikipedia.org/wiki/1A2_Key_Telephone_System

   A typical system consisted of a basic metal mounting frame, the Key Service Unit (KSU), also called a panel, with card-edge connectors and mounting brackets for components and punch-down blocks for interconnecting cabling. The principal switching and control modules were constructed on printed circuit boards, called Key Telephone Units (KTU).

6. List of keyboard switches - Wikipedia

   en.wikipedia.org/wiki/List_of_keyboard_switches

   Mounting type Factory lube SMD LED compatibility Key stroke lifespan Drop x Invyr Kailh Holy Panda [22] MX Type stem Tactile N/A 67 g 67 g 67 g 1.2 mm 4.0 mm Plate mounting No Yes 80 million Drop Kailh Halo True [23] MX Type stem Tactile N/A 60 g 54 g 100 g 1.9 mm 4.0 mm Plate mounting Yes Yes 80 million Drop Kailh Halo Clear [23] MX Type stem

7. Knox Box - Wikipedia

   en.wikipedia.org/wiki/Knox_Box

   A Knox vault in an academic building A Knox KeySecure, attached inside the cab of a fire engine, holds a high-security key [broken anchor] to open KnoxBox key boxes in the area. A Knox Box is a small, wall-mounted safe that holds building keys for fire departments, emergency medical services, and sometimes police to retrieve in emergency ...