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Sinclair: 30 years since Amstrad bought Spectrum-maker

It has been 30 years since inventor Sir Clive Sinclair sold the marketing and merchandising rights for his inventions to his then rival, Amstrad, for £5m.

His company rose to prominence in the 1970s with the success of its pocket calculators, and then became one of Britain's leading computer manufacturers the following decade with the ZX81 and ZX Spectrum home computers.

But other investments did not pay off.

Go to next video: Sir Clive Sinclair's life in computing