Calfax 820CD Handheld Electronic Calculator

This handheld electronic calculator has a plastic case with aluminum trim. The square plastic keys are indented at the middle (going from top to bottom). In addition to an array of ten digit keys and a decimal key, the calculator has keys for four arithmetic functions, a total key, a constant key, a red cancel key, and an on/off switch.
Behind the keyboard is an eight-digit red LED display.
A mark behind the display reads: calfax 820CD. A socket for an adapter is on the top edge. This example has no adapter.
The battery compartment at the top of the back would hold two batteries. No batteries or cover for the compartment are in the present example. A tag on the back gives an “Operating Outline” for the calculator. It includes a mark at the bottom: Made in Hong Kong.
The "calfax" mark on the calculator uses a trademark reportedly first used in commerce in 1972, filed in the United States January 1973, and registered in September 1975. No trademark registration is indicated on this example.
No serial number found.
Compare 1988.0988.20.
Currently not on view
Object Name
electronic calculator
date made
Physical Description
plastic (case; keys; display window material)
metal (trim material)
paper (sticker material)
overall: 7/8 in x 3 in x 5 1/2 in; 2.2225 cm x 7.62 cm x 13.97 cm
place made
Zhonghua: Hong Kong
ID Number
catalog number
accession number
Handheld Electronic Calculators
Computers & Business Machines
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of John B. Priser
Additional Media

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