Through his companies - Sinclair Radionics, Science Of Cambridge and Sinclair Research, Sir Clive developed some of the earliest pocket calculators, digital watches and most notably in 1980, one of the first complete home computers, the ZX80.
Some of his products -
• Aug 1972 - First 'pocket' calculator
• Sep 1975 - Digital watch
• Dec 1976 - Pocket television
• July 1978 - Mk14 microcomputer kit
• Feb 1980 - ZX80 home computer
• Apr 1982 - ZX Spectrum