Productivity improving technologies date back to antiquity, with rather slow progress until the late Middle Ages. Important examples of early to medieval European technology include the water wheel, the horse collar, the spinning wheel, the three-field system (after 1500 the four-field system—see Crop rotation) and the blast furnace.
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National Industrial Classification [All Economic Activities) 2008 Central Statistical Organisation Ministry of Statistics and...
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Steamindex home page. Number 11 (2005) The Railway in the landscape. 2-3. Britannia bridge across Menai Strait, c1890. Christensen, Mike. Annan (Shawhill) and the Solway Viaduct. 4-18.
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