This handheld electronic calculator has a white plastic case and nineteen rectangular plastic keys. These include ten digit keys, a decimal point key, four arithmetic function keys, a total key, a clear/clear entry key, and an exchange key. These keys also can be shifted to represent trigonometric and inverse trigonometric functions, memory, square roots, natural logarithms, exponents, inverses, and pi. To the right on the top row of keys is an on/off switch.
Text behind the keyboard reads: sinclair (/) Cambridge Scientific. Behind this is an eight-digit purple LED display.
The back of the calculator has a compartment for two AAA batteries. A mark on the lid to this compartment reads: Sinclair (/) MADE IN ENGLAND.
[Advertisement], Chicago Tribune, December 8, 1974, p. E30. Sinclair scientific calculator advertised as on sale for $89.95.
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