Unitrex 901M Handheld Electronic Calculator

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This handheld electronic calculator has a black and white plastic case and an array of twenty-two square plastic keys. The keys are colored red, white, and blue, on a larger black base. They include ten digit keys, a decimal point key, a total key, four arithmetic function keys, four memory keys, a percentage key and a clear key. Left of the top two keys is an on/off switch. Behind this is an eight-digit green vacuum fluorescent display. A mark behind this reads: UNITREX (/) 901M.
An opening for a power jack is along the back edge.
A compartment at the top of the back of the calculator holds two AA batteries. A sticker below this reads in part: UNITREX (/) electronic calculator. It also reads in part: MADE IN KOREA (/) UNITREX OF U.S.A. (/) SER. NO. 5716157.
[Advertisement], Chicago Tribune, August 29, 1976, p. S_A6. Unitrex 901M on sale for $12.95.
Currently not on view
date made
ca 1976
Eiko Business Machine Company
place made
Physical Description
plastic (case; keys material)
metal (circuitry material)
glass (display material)
overall: 7/8 in x 3 in x 5 1/4 in; 2.2225 cm x 7.62 cm x 13.335 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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