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  2. Doorbell - Wikipedia

    en.wikipedia.org/wiki/Doorbell

    Doorbell at the entrance of Chetham's Library, Manchester, England Sound of a two-tone mechanical doorbell. A doorbell is a signaling device typically placed near a door to a building's entrance. When a visitor presses a button, the bell rings inside the building, alerting the occupant to the presence of the visitor. Although the first ...

  3. Campanology - Wikipedia

    en.wikipedia.org/wiki/Campanology

    This is a diagram of one type of method ringing. Each bell strikes once in every sequence, or change, and repetition is avoided. Here 1 is the highest-pitched, and 6 is the lowest. Instead, a system of change ringing evolved, particularly in the early seventeenth century, which centres on mathematical permutations.

  4. Electric bell - Wikipedia

    en.wikipedia.org/wiki/Electric_bell

    The tone of the sound generated depends on the shape and size of the bell or gong resonator. Where several bells are installed together, they may be given distinctive rings by using different size or shapes of gong, even though the strike mechanisms are identical. Another type, the single-stroke bell, has no interrupting contacts.

  5. Door phone - Wikipedia

    en.wikipedia.org/wiki/Door_phone

    Video door phone indoor terminal.. Going a little further in time, we find video door phones featuring a video installation apart from the classical audio. In these cases, the intercom plate has the same structure as the previous version but features a video monitor connected to a surveillance camera that allows inspecting the person who pressed the button and part of the surrounding area.

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  7. Change ringing - Wikipedia

    en.wikipedia.org/wiki/Change_ringing

    The "diagram" of change ringing plain hunt on six bells. Two bells are shown. In method ringing, plain hunt is the simplest form of generating changing permutations in a continuous fashion, and is a fundamental building-block of many change ringing methods. The accompanying diagram shows plain hunt on six bells.

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  9. Vanderbilt QB Diego Pavia granted injunction to play in 2025 ...

    www.aol.com/sports/vanderbilt-qb-diego-pavia...

    Vanderbilt quarterback Diego Pavia was granted a major legal win on Wednesday when a judge granted him an injunction allowing him to play the 2025 season.. Pavia filed a lawsuit against the NCAA ...