Sperry Rand
Sperry Rand Corporation.
USA


Sperry Remington or Sperry Rand was a computer making conglomerate formed by the mergers of Sperry, Remington Rand, and Memorex.
One-time adding machine maker Burroughs had been already "eaten up" by one of the companies. In an interesting aside to their main business, they decided to sell portable calculators during the early 1970s. It appears that most (if not all) where made by Casio.
A few of their first models (661-D, etc.) have original designs, but the rest are Casio models with a different coloring and a "Sperry" nameplate. The company today is called "Unisys."


Source : vintagecalculators.com