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Many schools and office buildings now use audio / video systems to identify visitors trying to gain access to a locked building and can be interfaced with the building's access control system. Besides fixed locations, intercom systems are used on many types of vehicles including trains , watercraft , aircraft and armoured fighting vehicles .
The Rauland Corporation acquired the Webster-Chicago Corporation, a then-leader in school communications, making Rauland a dominant supplier of internal school communications systems. [ citation needed ] In 1948, Norm Rauland and George Borg started a new company, Rauland-Borg Corporation, continuing the sound and communications business.
Public address system in an old high school. The simplest, smallest PA systems consist of a microphone, an amplifier, and one or more loudspeakers. PA systems of this type, often providing 50 to 200 watts of power, are often used in small venues such as school auditoriums, churches, and coffeehouse stages.
An intercom telephone is a special kind of telephone that controls an intercom system. Intercom telephones can be found in residential, commercial, and educational settings. [1] For an example, a school is an environment that displays all the capabilities of an intercom
A wireless intercom is a telecommunications device that enables voice communication without the need to run copper wires between intercom stations. A wired intercom system may incorporate wireless elements. There are many types of wireless intercom systems on the market.
Comments such as “Heil Hitler” and threats to kill U.S. President Joe Biden were made over the school’s intercom.
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