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2. How to Change the Battery in Your Car Key Fob - AOL

   www.aol.com/change-battery-car-key-fob-194637492...

   On some key fobs, the battery type will be printed on the outside. This way, you can go to the store and select your battery before you need to open up the fob. Three of the most popular brands of ...

3. Key retainer - Wikipedia

   en.wikipedia.org/wiki/Key_retainer

   A key retainer device (KRD) is a small metal unit that is wall or door mounted, usually designed for the interchangeable core that retains one key (Key A) while the second key (Key B) is used for authorized purposes. When the key in use (Key B) is returned into the key retainer, the key held captive (Key A) is turned and then can be released.

4. Battery holder - Wikipedia

   en.wikipedia.org/wiki/Battery_holder

   Battery types such as the 9-volt have snap-on contacts. Battery holders for zinc-air batteries must not be completely air-tight since approximately 1 litre of air is required per ampere-hour of discharge per cell. The battery holder may include a valve integrated with the device power switch to allow air to be admitted when the device is ...

5. Trapped-key interlocking - Wikipedia

   en.wikipedia.org/wiki/Trapped-key_interlocking

   The key can then be used to unlock the kiln door. While the key is removed from the switch interlock, a plunger from the interlock mechanically prevents the power switch from being turned on. Power cannot be re-applied to the kiln until the kiln door is locked, releasing the key, and the key is then returned to the power switch interlock. [5]

6. 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 ...

7. List of military electronics of the United States - Wikipedia

   en.wikipedia.org/wiki/List_of_military...

   Portable radio, HF 100W AM/CW/USB/RTTY, powered by AC supply, battery or generator, transported in two boxes including all accessories for operation: AN/PRC-49: Survival radio: AN/PRC-63: Survival radio: AN/PRC-65: Portable transceiver, Ultra high frequency (UHF)-band, 1,120 channels, 100-156 mc, 6 lbs: Simmonds Precision Products AN/PRC-66