The mystery of the rogue HP calculator: 12C or not 12C?

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Brazilian model flummoxes calc fans

For most of us, a calculator might have been superseded by Excel or an app on a phone, yet there remains a die-hard contingent with a passion for the push-button marvels. So the shocking discovery of an apparently rogue HP-12C has sent tremors through the calculator aficionado world.…

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