The lower register showed the number of items added or subtracted, multipliers, and quotients. The upper register showed totals, subtotals, products etc. The Friden SRW was an imposing calculator weighing 42lbs. The new model looked very much like the Friden STW on which it was based but it added the amazing ability to extract a square root at the touch of a single key. In 1952 Friden shook up the market with the SRW. Most of the models sold in 1950 looked a lot like the more advanced models of 1915 with Friden and Monroe selling most of the units. By the 1950's, four function motor driven mechanical calculators had become common on the desks of engineers and scientists.
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