Unitrex Mini 8 Handheld Electronic Calculator

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This handheld electronic calculator has an off-white plastic case and an array of nineteen rectangular plastic keys. These include ten digit keys, a decimal point key, four arithmetic function keys, a total key, a percentage key, a clear entry key, and a clear key. Above the keyboard on the right is the on/off switch. A mark next to it reads: UNITREX (/) mini 8.
Behind these is an eight-digit red LED display. A jack for a power adapter is along the back edge.
The back has a compartment for a nine-volt battery. A mark on the back of the cover of this compartment reads: A57K11831. Text impressed into the calculator at the base of the back reads: UNITREX mini 8 (/) EIKO BUSINESS MACHINE CO. LTD. (/) DC 9V 0.5W (/) MADE IN JAPAN.
The case is very similar to the Unitrex Mini Handy 80R (1986.0988.018).
[Advertisement], Atlanta Constitution, December 19, 1974, p. 27A. Unitrex Mini 8 selling for $19.95.
[Advertisement], Boston Globe , August 7, 1975, p. 28. Unitrex Mini 8 selling for $15.95, regularly $19.95.
[Advertisement], Washington Post, August 25, 1977, p. D6. Unitrex Mini 8 offered in clearance sale for $4.99. Sold previous year for $7.95.
Currently not on view
date made
Eiko Business Machine Company
place made
Physical Description
plastic (case; keys material)
metal (circuitry material)
overall: 7/8 in x 2 1/2 in x 5 1/8 in; 2.2225 cm x 6.35 cm x 13.0175 cm
ID Number
catalog number
accession number
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History


Processor is marked "Fr" which stands for "Frontier INC" a company created by EIKO and Caltex. That company permitted EIKO to use processor made in the US without paying the taxes.

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