Mach VI Slide Rulette Handheld Electronic Calculator

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This handheld electronic calculator has a metal and plastic case, a plastic display cover, and fifteen square plastic keys. These include ten digit keys, a decimal point key, four arithmetic function keys, a total key, two memory keys, and a clear key. Above the keys are a decimal point switch (floating decimal point, two digits after the decimal point, or four digits after the decimal point) and a subtraction/summation switch. Behind this is a green fluorescent display. Text on the display cover reads: MACH VI (/) SLIDE RULETTE.
An on/off switch and a socket for a power adapter are on the back edge. The back has a compartment at the bottom that would hold four batteries. A sticker above this reads: MACH VI (/) RATING 6V-DC 0.5W (/) NO. 001432 (/) MADE IN JAPAN.
Advertisements for the Mach VI from 1975 list prices ranging from $69.95 down to $29.97.
Compare the Unisonic 737 calculator (1986.0988.119). The terms MACH, Unisonic and SLIDE RULETTE, as applied to calculators, were all trademarks of the North American Foreign Trading Corporation of New York City, New York.
[Advertisement], Kansas City Times, August 27, 1975, p. 71. On sale for $29.97. Sold as a Unisonic calculator.
[Advertisement], Frederick News Post, March 11, 1975. Mach VI on sale for $49.95, down from a regular price of $69.95.
Currently not on view
date made
place made
Physical Description
metal (case; keyboard; circuitry material)
plastic (keys; display cover material)
overall: 1 in x 3 3/8 in x 5 1/4 in; 2.54 cm x 8.5725 cm x 13.335 cm
ID Number
catalog number
accession number
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History


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