Unitrex Mini Handy 80R Handheld Electronic Calculator

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This handheld electronic calculator has an off-white plastic case and an array of twenty rectangular plastic keys. These include ten digit keys, a decimal point key, four arithmetic function keys, a change sign key, a percentage key, a square root key, a clear entry key, and a clear key. Above the keyboard on the right is the on/off switch. Left of it is a switch for setting a constant and left of this a switch for setting the position of the decimal point.
Behind these is an eight-digit red LED display. A mark behind it reads: UNITREX (/) mini handy 80R. 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: A17D03893. Text on a sticker attached to the calculator at the base of the back reads: UNITREX mini handy 80R (/) EIKO BUSINESS MACHINE CO. LTD. (/) DC 9V 0.45W MADE IN JAPAN.
The case is very similar to that of the Unitrex Mini 8 (1986.0988.017).
[Advertisement], Chicago Tribune, November 28, 1974, p. C11. Unitrex Mini Handy 80R regularly $39.95, on sale for $34.95.
Currently not on view
date made
ca 1974
Eiko Business Machine Company
place made
Physical Description
plastic (case; keys material)
metal (circuitry material)
paper (sticker material)
overall: 7/8 in x 2 3/4 in x 5 in; 2.2225 cm x 6.985 cm x 12.7 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


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