Calculator watch financial functions (in the Casio CBA-10). Usually calculator watch operates with eight digits number, however, calculator watch can operate with 6 digits (for example, Casio C-801) or 10 digits (Casio CBA-10) numbers. Calculator watches first appeared in the mid 1970s introduced by Pulsar (1975, then a brand of the Hamilton Watch Company) and Hewlett Packard. Several watch manufacturers have made calculator watches over the years, such as Pulsar and Timex, but the Japanese electronics company Casio produced the largest variety of models. In the mid-1980s, Casio created the Databank calculator watch, which not only performed calculator functions, but also stored
Ultra Electronics Ultra Electronics Ultra Electronics Holdings () is a British company serving the defence, security, transport and energy industries. It is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index. The Company was started by Teddy Rosen in 1920 as "Edward E. Rosen & Co." manufacturing high quality headphones. In 1923 the company moved to new premises at Harrow Road, London and in 1925 a new company "Ultra Electric Ltd." was formed. Ultra introduced its first mains powered wireless set in 1931. After further expansion the company moved to larger premises at Erskine Road, Chalk