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Wall Street's Cult Calculator Turns 30


Dave Harms w HP 12c

Dennis Harms, pictured in 2006, helped create the HP 12c.

Corvallis Gazette Times / Associated Press

Matthew Rothman bought an HP 12c financial calculator for his first job out of college in 1989. Years later, he still has the same calculator. And he still uses it constantly, just like thousands of other 12c enthusiasts.

From The Wall Street Journal
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