Keystone Electronics Berkey 4030 Handheld Electronic Calculator

Description:

After achieving some success selling four-function calculators, the Keystone Division of Berkey Photo, Inc., began to manufacture calculators with more extensive capabilities. This handheld electronic calculator has a plastic case and trim, a metal keyboard painted black, and thirty plastic keys with a square base and circular tops. The four lower rows of keys include ten digit keys, a decimal point key, a key for the number pi, four arithmetic function keys, a total key, a cancel key, a change sign key, and a memory key. Two rows of function keys above this are for trigonometric and inverse trigonometric functions, exchange, exponents, natural logarithms, powers, logarithms to the base 10, and square roots. Above these are low power and charging indicator lights, a radian/degree switch, and an on/off switch. The socket for a power jack is on the right side near the top.

A mark above the keyboard reads: Berkey 4030. Behind this is a nine-digit vacuum fluorescent display. Behind this, attached to the back edge, is a loop that makes it possible to suspend the calculator. A mark on the front edge reads: Made in U S A.

A sticker on the back gives instructions. Text at the bottom reads: Berkey (/) 2 Keystone Place (/) Paramus, New Jersey 07652 Serial # C223502.

Received in a brown leather carrying case with a loop on the back and two loops at the top. The case is stamped: Berkey. It has a pouch for an instruction booklet, but no such booklet.

Compare 1986.0988.159.

Reference:

[Advertisement], New York Times, June 2, 1974. “New Berkey 4030” advertised as selling for a special price of $154.50.