NCR Class 18-22 Electronic Calculator

In the late 1960s and 1970s, desktop electronic calculators replaced mechanical adding and calculating machines. The Nippon Calculating Machine Corporation of Japan sold such machines under the brand name Busicom. It also supplied other firms with electronic calculators sold under other names. This is a Busicom electronic calculator sold by the Dayton, Ohio, firm of NCR.
The machine has nine digit keys and a 0 bar. Clear and clear entry keys are left of the digit keys. Keys to the right of the digit keys are for the four arithmetic operations and memory access. Apparently nine or ten digit numbers may be entered, with results of up to twelve digits.
A tag attached at the top reads: NCR. A tag attached to the back reads; NCR (/) Class 18-22. It also reads: THE NATIONAL CASH REGISTER COMPANY. (/) MADE IN JAPAN. It also reads: NO. 1-9940221. This serial number indicates a date of 1972.
Currently not on view
Object Name
electronic calculator
date made
ca 1972
Nippon Electric Co.
Physical Description
plastic (case, keys material)
rubber (cord material)
metal (base material)
overall: 3 in x 8 7/8 in x 11 in; 7.62 cm x 22.5425 cm x 27.94 cm
place made
ID Number
accession number
catalog number
See more items in
Medicine and Science: Computers
Desktop Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History, Kenneth E. Behring Center


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