The SCM (Smith-Corona Marchant) company manufactured a number of electronic calculators in the late 1960s and early 1970s. The early machines were named "Cogito", meaning "to think" in latin. Some of the later machines had either a Marchant model number or just a model number.
Following are photographs of several machines from the SCM portfolio. Additional information regarding the machines' operation and will be added later.
SCM Marchant I 8-digit portable Nixie-Tube Calculator
The Marchant I is probably the smallest electronic calculator to use nixie tubes for the display. It was packaged for portable use, with a slide-up keyboard cover and a flip-up display cover to protect the machine when tossed into a briefcase. The machine contained a Ni-Cad battery pack so that it could be truly "portable" - although it was far too large to be considered a "pocket calculator".
SCM Marchant 410 10-digit Nixie-Tube Calculator
SCM Marchant Cogito 414 14-digit Nixie-Tube Calculator