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
Vestax Vestax The Vestax Corporation was a Japanese musical instrument, turntable and audio equipment firm founded by Hidesato Shiino in 1977. The company started by designing and manufacturing electronic guitars. In the 1980s, Vestax produced multitracks recorders and later move to making DJ mixers, professional turntables, compact disc players and signal processors. Debt troubles lead to the company's bankruptcy at the end of 2014. The Vestax Corporation of Japan began in 1977 as a designer and manufacturer of electronic guitars. In the 1980s Vestax introduced a series of cassette-based multitracks, including the Vestax MR66, to challenge established products from Fostex, Yamaha