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Airspeed indicator — The airspeed indicator or airspeed gauge is an instrument used in an aircraft to display the craft s airspeed, typically in knots, to the pilot. Markings Light aircraft Airspeed indicator markings use a set of standardized colored bands and lines … Wikipedia
Caliper — For other uses, see Caliper (disambiguation). A vernier caliper … Wikipedia
Ouija — This article is about spiritualist use of the ouija board. For other uses, see Ouija (disambiguation). A modern ouija board plus planchette … Wikipedia
Inventions in medieval Islam — A significant number of inventions were developed in the medieval Islamic world, a geopolitical region that has at various times extended from Al Andalus and Africa in the west to the Indian subcontinent and Malay Archipelago in the east.… … Wikipedia
Clock — For other uses, see Clock (disambiguation). Timepiece redirects here. For the Kenny Rogers album, see Timepiece (album). Platform clock at King s Cross railway station, London … Wikipedia
De Dondi — Jacopo and Giovanni de Dondi (father and son) were scholars active in 14th century Padua, Italy, and are remembered today as being pioneers in the art of clock design and construction. The Astrarium, designed and built by Giovanni de Dondi over a … Wikipedia

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