apart from the calculator has he also invented anything else?
Portable television, Sinclair Micro-amplifier and digital watch
Sinclair Radionics
In 1966, Sinclair Radionics developed the world's first portable television
what is sinclair executive? World's first "slimline" pocket calculator who invented it? Sinclair Radionics where is he from? Cambridge, England
wiki:17849204
Sinclair Radionics [SEP] Portable televisions
In 1966, Sinclair Radionics developed the world's first portable television, the "Microvision", but never attempted to sell it because development costs would have been too high based on the complicated design the Microvision used. In April 1976, the National Enterprise Board bought a 43% stake in Sinclair Radionics for £650,000, and in October the National Research and Development Council agreed to provide £1 million for a revived portable TV project, which was finally launched in January 1977 as the Microvision TV1A and MON1A at £99.95. Supply exceeded demand, and 12,000 units were left unsold until they were sold off cheaply.