Sharp EL-428 ELSI MATE
This hybrid calculator has the standard four arithmetic functions, plus square root, percentage, and memory functions. It also has an abacus attached - the abacus being quicker for simple arithmetic such as addition and subtraction, while the calculator would be used for multiplication and division.
Purchased August 1983 in Kyoto by Dr W J Herbert during a congress of the International Union of Immunological Societies.
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This exhibit has a reference ID of CH36268. Please quote this reference ID in any communication with the Centre for Computing History.