Casio fx-140 calculator
The Casio company takes its name from its founder, Tadao Kashio, who established a small mechanical manufacturing business in Tokyo in 1946. During the early 1950s Kashio and his three brothers developed an electro-mechanical calculating machine based on telephone relay technology. The machine used over 300 relays and weighed 140kg, but was apparently quite successful. The Casio Computer Company was established in 1957 to develop and manufacture the relay-driven calculators.
10-digit scientific calculator with a fluorescent display
Kindly donated by Francis Hookham
Manufacturer: Texas Instruments
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This exhibit has a reference ID of CH31350. Please quote this reference ID in any communication with the Centre for Computing History.