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  • 21Edinburgh Castle — For the estate in Jamaica, see Edinburgh Castle, Jamaica. Edinburgh Castle Edinburgh, Scotland GB grid reference NT250734 …

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  • 22Inventions 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.… …

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  • 23Referenzspannungsquelle — Eine Referenzspannungsquelle ist eine Spannungsquelle, deren Spannung als Referenz für einen Mess oder Regelungsprozess herangezogen wird. In der Regel besitzen Referenzspannungen eine konstruktionsbedingt feste Spannung. Je nach innerem Aufbau… …

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  • 24Buck converter — A buck converter is a step down DC to DC converter. Its design is similar to the step up boost converter, and like the boost converter it is a switched mode power supply that uses two switches (a transistor and a diode) and an inductor and a… …

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  • 25Wally Rippel — Wally E. Rippel is a long time developer and advocate of battery electric vehicles.Wally has a prominent role, labeled as himself, Research Engineer, AeroVironment, in the 2006 documentary movie Who Killed the Electric Car? , including two brief… …

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  • 26Silicon-controlled rectifier — A silicon controlled rectifier (or semiconductor controlled rectifier) is a four layer solid state device that controls current. The name silicon controlled rectifier or SCR is General Electric s trade name for a type of thyristor. The SCR was… …

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  • 27Abkürzungen/Luftfahrt/E–K — Dies ist der dritte Teil der Liste Abkürzungen/Luftfahrt. Liste der Abkürzungen Teil 1 A A Teil 2 B–D B; C; D Teil 3 E K E …

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  • 28Vacuum tube — This article is about the electronic device. For experiments in an evacuated pipe, see free fall. For the transport system, see pneumatic tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… …

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  • 29History of timekeeping devices — For thousands of years, devices have been used to measure and keep track of time. The current sexagesimal system of time measurement dates to approximately 2000 BC, in Sumer. The Ancient Egyptians divided the day into two 12 hour periods, and… …

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  • 30Military equipment of Turkey — The military equipment of Turkey includes a wide array of arms, artilleries, large surface vessels, cannons, armored vehicles, mortars, unmanned vehicles and many different equipments. Contents 1 Historical development 1.1 General 1.2 1923 1950 …

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