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Power in Your Pocket

HP-35 "Electronic-Slide-Rule" Calculator

This was the “slide rule killer” that engineers had dreamed about – but at a much higher price.

Power in Your Pocket

Hewlett-Packard co-founder Bill Hewlett issued a challenge to his engineers in 1971: Fit all of the features of their desktop scientific calculator into a package small enough for his shirt pocket.

They did. More than 100,000 HP-35 pocket calculators sold the first year at $395 each.

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TI SR-50 “Electronic-Slide-Rule” calculator

This was Texas Instrument's early challenge to the HP-35 scientific handheld calculator. The TI SR-50 was much less expensive.

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HP-65 Programmable Scientific Calculator

This was HP’s first programmable handheld calculator. 100 line programs could be stored on magnetic cards.

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HP-80 Business Calculator

This business calculator could do complex financial calculations with one keystroke. The cradle encouraged colleagues to ask before borrowing

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Related Content

Learn more about the innovative design of the HP-35 calculator in this case study by HP-35 team member David S. Cochran.