Unisonic 737 Handheld Electronic Calculator

This handheld electronic calculator has a metal and plastic case with an array of twenty-five square plastic keys. These include ten digit keys, a decimal point key, two memory keys, a clear key, four arithmetic function keys, a total key, and a percentage key. Above the keyboard 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. A mark behind this reads: Unisonic 737 (/) SLIDE RULETTE. Behind this is a green vacuum fluorescent display. Another switch and a jack for a power supply are along the back edge. Text on the back reads: Unisonic 737 (/) RATING 6V-DC 0.5W (/) NO. 028723 (/) MADE IN JAPAN. Below this is a compartment for four AA batteries.

Compare MachVI Slide Rulette (1986.0988.254).

Reference:

[Advertisement], Washington Post, May 15, 1974, p. E7. Unisonic 737 “pocket memory calculator,” regularly priced at $69.96, on sale for $59.88.

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