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valve galvanometer

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  • Fleming valve — schematic from US Patent 803,684. The Fleming valve, also called the Fleming oscillation valve, was a vacuum tube diode invented by John Ambrose Fleming and used in the earliest days of radio communication. As the first vacuum tube, the IEEE has… …   Wikipedia

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  • English inventions and discoveries — are objects, processes or techniques which owe their existence either partially or entirely to a person born in England; in some cases, their Englishness is determined by the fact that they were born in England, of non English people working in… …   Wikipedia

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