Rockwell 18R Handheld Electronic Calculator

This handheld electronic calculator has a dark brown and light tan plastic case and twenty rounded rectangular plastic keys. In addition to ten digit keys and a decimal point key, it has a clear entry/clear key, four arithmetic function keys, a total key, a percentage key, and two memory keys. A mark above the keyboard reads: MEMORY. The on/off switch is on the left side. Behind the keyboard is an eight-digit LED display. Text left behind the display reads: Rockwell. A mark scratched above this reads: WO305406. A jack along the back edge would hold a power adapter.
The back of the calculator has four feet and a compartment at the top for a nine volt battery. A sticker below this gives operating examples. Text near the bottom reads: Rockwell (/) International Microelectronics Product Division (/) Anaheim, CA 92803. Further text reads: Calculator Model 18R (/) Assembled in Mexico (/) U.S. and Foreign Parts. Further text reads: Ser [sic] (/) No. 144265.
The calculator has a plastic carrying case marked on the front: Rockwell.
[Advertisement], Chicago Tribune, December 4, 1975, p. A6. Rockwell 18R advertised as selling for $19.88.
[Advertisement], Los Angeles Times, February 15, 1976, p. A12. Rockwell 18R advertised as selling for $13.88.
[Advertisement], Washington Post, February 11, 1977, p. C24. Rockwell 18R advertised as selling for $9.77.
Currently not on view
Object Name
electronic calculator
date made
Rockwell International
Physical Description
plastic (case; carrying case; keys; display cover material)
metal (circuitry material)
paper (sticker material)
overall: 7/8 in x 3 in x 6 in; 2.2225 cm x 7.62 cm x 15.24 cm
place made
ID Number
catalog number
accession number
Computers & Business Machines
Handheld Electronic Calculators
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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