KMC 7500C Handheld Electronic Calculator

This solar-powered electronic calculator has a tan and gray plastic case and twenty-four plastic keys. Twenty-three keys are square; the addition key is rectangular. In addition to ten digit keys, a decimal point key, a total key, and four arithmetic function keys, the calculator has three memory keys, a change sign key, a square root key, a percentage key, and an on/clear key.
Behind the keyboard is the solar power cell. Text next to it reads: KMC 7500C. Above this is the eight-digit LCD display. It lights up and the calculator carries out calculations, but the results are not necessarily accurate. Text on the back of the calculator reads: ELECTRONIC CALCULATOR (/) POWER SOURCE SOLAR CELL (/) MADE IN TAIWAN. Unscrewing four screws makes it possible to lift off the back of the calculator. A mark on the circuit board reads: SD9-13.
According to records of Canadian trademarks, in 1982 Kmart Canada began using the trademark KMC for calculators and other devices sold in its stores. The trademark was registered in 1984 and discontinued in 1999. The KMC mark on the calculator indicates that the trademark is registered. No such trademark, as applied to calculators, is included in the U.S. registry of trademarks. The calculator came to the museum from Canada in 1988. Hence it seems likely that the calculator was distributed by Kmart Canada and made around 1986.
Web site of the Canadian Intellectual Property Office.
Object Name
electronic calculator
date made
ca 1986
Physical Description
plastic (case; keys; display cover material)
metal (circuitry; screws material)
gallium arsenide (display circuits material)
average spatial: 1 in x 4 1/4 in x 4 3/4 in; 2.54 cm x 10.795 cm x 12.065 cm
place made
ID Number
catalog number
accession number
Computers & Business Machines
Handheld Electronic Calculators
See more items in
Medicine and Science: Mathematics
Handheld Electronic Calculators
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Michael R. Williams
Additional Media

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