An operating theater (also known as an operating room, operating suite, theatre operation suite or OR) is a facility within a hospital where surgical operations are carried out in a sterile environment. Historically, the term "operating theatre" referred to a non-sterile, tiered theater or amphitheater in which students and other spectators could watch surgeons perform surgery. http://www.airtech.com.sg/product/productdetails/surgical-room-ceiling
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