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Sir Clive Marles Sinclair (born July 30, 1940) is a well-known British entrepreneur and inventor of the world's first 'slim-line' electronic pocket calculator in 1972 (Sinclair Executive) and the ZX80, ZX81 and ZX Spectrum computers in the late 1970s and early 1980s, amongst many other things. The ZX80 was the UK's first mass market home... Full Article