Rockwell 9TR Handheld Electronic Calculator

Rockwell 9TR Handheld Electronic Calculator

<< >>
Usage conditions apply
This handheld electronic calculator has a green plastic case and eighteen 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, and a percentage key. A sticker above the keyboard reads in part: nheim. The on/off switch is on the left side. Behind the keyboard is an eight-digit LED display. Text behind the display reads: Rockwell. 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.. (/) Anaheim, CA... (/) Calculator Model 9TR (/) Assembled in Mexico (/) U.S. and Foreign Parts. Further text reads: Ser. (/) No. 167898.
According to Ball and Flamm, this model of a Rockwell calculator was especially manufactured for True Value Hardware stores. Compare the Rockwell 8R (1988.0988.12).
[Advertisement], Chicago Tribune, August 15, 1975, p. 8. Model 9TR advertised by a True Value hardware store as on sale for $14.88.
[Advertisement], Chicago Tribune, December 10, 1976, p. 19. Model 9TR advertised by a True Value hardware store as on sale for $7.99.
Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 126.
Currently not on view
Object Name
electronic calculator
Other Terms
electronic calculator; Handheld
date made
Rockwell International
place made
Physical Description
plastic (case; keys; display cover material)
metal (circuitry material)
paper (sticker material)
overall: 1 in x 3 in x 6 in; 2.54 cm x 7.62 cm x 15.24 cm
ID Number
catalog number
accession number
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Computers & Business Machines
Handheld Electronic Calculators
Data Source
National Museum of American History
Nominate this object for photography.   

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.


I am sorry my calculator is a Rockwell Electronic Calculator with Percent Model 9TR Serial # 101252. The box is worn and someone did some addition in ink on the box and the paper tray it was in. There is a Owner's Manual with it. The calculator is in excellent condition.

Note: Comment submission is temporarily unavailable while we make improvements to the site. We apologize for the interruption. If you have a question relating to the museum's collections, please first check our Collections FAQ. If you require a personal response, please use our Contact page.