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  2. Selective calling - Wikipedia

    en.wikipedia.org/wiki/Selective_calling

    To enforce this rule, base stations often have a monitor switch on the microphone. The push-to-talk button is split into two segments. One segment turns the selective calling off. The other segment of the button transmits. A mechanical interlock prevents the transmit button from being pressed until the monitor button is down.

  3. Stericated 5-simplexes - Wikipedia

    en.wikipedia.org/wiki/Stericated_5-simplexes

    A stericated 5-simplex can be constructed by an expansion operation applied to the regular 5-simplex, and thus is also sometimes called an expanded 5-simplex.It has 30 vertices, 120 edges, 210 faces (120 triangles and 90 squares), 180 cells (60 tetrahedra and 120 triangular prisms) and 62 4-faces (12 5-cells, 30 tetrahedral prisms and 20 3-3 duoprisms).

  4. Remote keyless system - Wikipedia

    en.wikipedia.org/wiki/Remote_keyless_system

    As of 2024, Ford continued to offer a fob-operated remote keyless system or completely keyless system, augmented by its Securicode five-button keypad. [5] The combination enabled tiered or time-restricted permissions, i.e., the code giving access to the vehicle but not its operation — and the code being easily changed to prevent subsequent ...

  5. Cantellated 5-simplexes - Wikipedia

    en.wikipedia.org/wiki/Cantellated_5-simplexes

    In five-dimensional geometry, a cantellated 5-simplex is a convex uniform 5-polytope, being a cantellation of the regular 5-simplex. There are unique 4 degrees of cantellation for the 5-simplex, including truncations.

  6. Watchclock - Wikipedia

    en.wikipedia.org/wiki/Watchclock

    A watchclock is a mechanical clock used by security guards as part of their guard tour patrol system which require regular patrols. The most commonly used form was the mechanical clock systems that required a key for manual punching of a number to a strip of paper inside with the time pre-printed on it.

  7. Glossary of locksmithing terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_locksmithing_terms

    The lock housing is the part of the lock that does not move when the lock is opened. It is responsible for transferring the action of the key to the bolt. [7] Master pin In a pin tumbler lock, a master pin is an optional, usually short, disk-like pin placed between the top and bottom pins. Its purpose is to allow two differently-cut keys to ...

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