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Trapdoor
Sliding or hinged door that is flush with the surface of a floor, ceiling, or roof / From Wikipedia, the free encyclopedia
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For other uses, see Trapdoor (disambiguation).
A trapdoor is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof.[1] It is traditionally small in size.[2] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time.[3] The trapdoor has played a pivotal function in the operation of the gallows, cargo ships, trains,[4] booby traps,[5] and more recently theatre and films.[6][7]
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