As I recall this SR-10 was the first affordable electronic calculator with some "advanced" functions. There was that HP model, but it was about 3-times more. This "advanced" model cost $150 in 1974 ($655 in 2010 dollars); the HP at $400 in 1974 was just too much ($1750 in 2010 dollars).
Well, it was a step up from those old coffee grinder adding machines we used to add up the expense accounts.
Adios
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