Sinclair Executive [SEP] manufacturer
Sinclair Executive
The Sinclair Executive was the world's first "slimline" pocket calculator, and the first to be produced by Clive Sinclair's company Sinclair Radionics. Introduced in 1972, there were at least two different versions of the Sinclair Executive, with different keyboard markings, and another called the Sinclair Executive Memory, introduced in 1973.
Its small size was made possible by pulsing the current to the Texas Instruments TMS1802 "calculator on a chip" integrated circuit, reducing the power consumption by a factor of more than 10
Earl of Caithness (died 1582) (resigned 1545)
- John Sinclair, Master of Caithness ( – Sep 1575)
- George Sinclair, 5th Earl of Caithness (1566–1643)
- George Sinclair, 6th Earl of Caithness (died 1677) (resigned 1672)
- John Campbell, 1st Earl of Breadalbane and Holland (1633–1717) (resigned 1681)
- George Sinclair, 7th Earl of Caithness (died 1698)
- John Sinclair, 8th Earl of Caithness (died 1705)
- Alexander