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A dropped ceiling is a secondary ceiling, hung below the main (structural) ceiling. It may also be referred to as a drop ceiling, T-bar ceiling, false ceiling, suspended ceiling, grid ceiling, drop in ceiling, drop out ceiling, or ceiling tiles and is a staple of modern construction and architecture in both residential and commercial applications.
Document cameras can be used instead of overhead projectors. [1] A document camera can enlarge the small print in books and project a printed page as if it were a traditional transparency by using a zoom feature. Most document cameras can also send a video signal to a computer. [citation needed]
In September 1968, Olean, New York, was the first city in the United States to install CCTV video cameras along its main business street in an effort to fight crime. [25] Marie Van Brittan Brown received a patent for the design of a CCTV-based home security system in 1969. (U.S. patent 3,482,037).
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Flock Safety cameras along roadways gather vehicle details for about 400 customers in North Carolina, including 100 law enforcement agencies. After battle with regulators, Flock Safety can install ...
Space between the structural ceiling and the dropped ceiling or under a raised floor is typically considered plenum; however, some drop-ceiling designs create a tight seal that does not allow for airflow and therefore may not be considered a plenum air-handling space. [1] [2]
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