general/hp-programmable-calculators
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HP 35s
Programmable scientific calculator produced by Hewlett-Packard
HP-41C
Hewlett-Packard handheld RPN calculator
HP-55
Handheld calculator by HP
HP-67/97
Calculator
HP-65
Programmable handheld calculator with magnetic card reader
HP-34C
Continuous memory calculator
HP-71B
Late 1980s programmable handheld computer
HP Voyager
Programmable calculator, 1982–1984