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A simple dumbwaiter is a movable frame in a shaft, dropped by a rope on a pulley, guided by rails; most dumbwaiters have a shaft, cart, and capacity smaller than those of passenger elevators, usually 45 to 450 kg (100 to 992 lbs.) [2] Before electric motors were added in the 1920s, dumbwaiters were controlled manually by ropes on pulleys. [1]
George W. Cannon was an American inventor from New York.He is best known for the invention of the mechanical dumbwaiter.Cannon first filed for the patent of a brake system (US Patent no. 260776) that could be used for a dumbwaiter on January 6, 1883. [1]
During the Second World War the company was one of the contractors engaged in building the Mulberry harbour units. [2] During 1981, the company was acquired by F J C Lilley plc, [3] which traded as Lilley plc from April 1989. [4] until it went into receivership during January 1993. [5] [6] Melville Dundas was bought out of receivership by its ...
The history of construction traces the changes in building tools, methods, techniques and systems used in the field of construction.It explains the evolution of how humans created shelter and other structures that comprises the entire built environment.
Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
A dumbwaiter (lit. "silent waiter") is a small freight elevator. Dumbwaiter may also refer to: Lazy Susan, a small rotating table to serve food on a table; The Dumb Waiter, a 1957 one-act play by Harold Pinter; Dumb Waiters, a 1980 album by The Korgis "Dumb Waiters" (song), a 1981 song by the Psychedelic Furs
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Abigroup was established as Graham Evans & Co in 1957 as a civil engineering company within New South Wales, being renamed Abignano in 1961. In 1981 it was listed on the Australian Securities Exchange. In 1984 Abignano acquired Enacon followed in 1987 by Robert Salzer Constructions. [1] [2]