The Executive calculator and the Black Watch were products from which inventor?
Sinclair Executive consumption, creating issues with the reliability. The Executive Memory was launched in November 1973, with the same physical dimensions as the original, but with the ability to memorise subtotals from any number of chain calculations. There were at least 3 versions, including the black and white Type 1, and the Type 2 with a gold keyboard. The Executive Memory sold at the lower price of . 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
Calculator watch Calculator watch A calculator watch is a digital watch with a built in calculator, usually including buttons on the watch face. Calculator watches were first introduced in the 1970s and continue to be produced, despite falling from their peak popularity during the 1980s. The most notable brand is the Casio Databank series, though watches made by Timex were also popular. Most calculator watches contain only a few number of functions such as +, -, x, / and percents. However, there are several models with additional functions: scientific, including transcendent and trigonometry, in models Casio CFX-200, CFX-400, Citizen 49-9421, and also