Burroughs Adding Machines Ltd of Detroit Michigan was the first company to occupy a factory at Strathleven. During the European reconstruction in the late 1940's Burroughs built a major new factory at Strathleven in Scotland, initially to assemble machines from US-made parts and later to manufacture the full product range for the British and Commonwealth markets. Most of the post-war calculators and portables found in Australia are from the Strathleven factory.This manually operated calculator predates the the rise of the modern computer.A manually operated Burrough's adding machine. It is a greyish green plastic and has a silver handle. It has 8 columns to add manuaIly and has decimal currency. There is a roll of white (slightly yellowed) paper inserted in the top section.On front -P3981115 mathematics accounting burroughs adding-machine business calculator