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HP-80 business pocket calculator, 1973
The first pocket-size business calculator, the HP-80 was introduced following the success of the HP-35 handheld scientific calculator. This product shared many features of the HP-35 but was geared toward business users as opposed to scientific and technical customers. A desktop printing version, called the HP-81, was also made available.
The HP-80 was HP's second handheld electronic calculator and its first business model.