20 page Atlas-Rand manual. Some early manufacturers of electronic calculators had their beginnings as makers of photographic equipment. One of these was the Keystone Division of Berkey Photo, Inc. Keystone Camera Company traced its origins to a company founded in Boston, Massachusetts, in1910. Early products included movie cameras and projectors. In 1966, Berkey Photo, Inc. acquired Keystone. By 1973, the Keystone Camera Division of Berkey, with its factory in Clifton, New Jersey, had expanded to making instant-load cameras with electronic flash. It also, from late 1972 until at least 1975, made handheld electronic calculators. The Atlas-Rand 240 calculator resembles one of the first handheld calculators mentioned as a product of Berkey-Keystone. It has a black plastic case, a metal keyboard and trim, and eighteen plastic keys. A series of similar distinctive calculators was sold under the Atlas-Rand, Berkey, and Keystone names. These solidly built models are unusual in using the Burroughs Panaplex II amber gas-discharge display, normally only found in desktop calculators.