Universal Data Machine TKB 0001 Handheld Electronic Calculator

This handheld electronic calculator has a cream-colored case and an array of eighteen "Klixon" keys. Such keys have a design trademarked by Texas Instruments and make a distinctive click when pressed. In addition to ten digit and one decimal point key, the calculator has four keys for arithmetic functions. One serves as a total key for addition and another as a difference key for subtraction. The top of the keyboard has a constant switch, a D key for recalling the display (it turns off after several seconds), a clear entry key, and a red clear key. The eight-digit red LED display is behind the keyboard. An on/off switch and a socket for a cord for recharging the battery are at the top back. This example has no cord.

The back has four plastic feet. A paper sticker there reads in part: ELECTRONIC CALCULATOR (/) MODEL TKB 0001 (/) SERIAL: A 05777 (/) VOLTS: 7.2V, DC (/) MFG. IN UNITED STATES BY (/) Universal Data Machine (/) Corporation (/) 4611 N. Ravenswood St. (/) Chicago, Ill. 60640.

This is one of the earliest commercial handheld electronic calculators manufactured in the United States.

Compare to the Bowmar 901B (1986.0988.129) and the Craig 4501 (1987.0435.25).

References:

Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 174. This source indicates that the calculator was advertised in late 1972 as selling for $99.95.

[Advertisement], Chicago Tribune, July 18, 1972, p. 13. This advertisement gives a regular price of $179.95 and a sale price of $149.95.

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