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HP 35s: Programmable scientific pocket calculator with 31 KB user memory, RPN + algebraic input, battery

HP 35s Solving Systems of Linear or Simultaneous Equations

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Hewlett Packard HP-35S Calculator User's Guide

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HP 35s Programmable Scientific Calculator Review and Tutorial

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HP 35s Scientific Calculator - TheCalculatorStore

HP 35S Technical Scientific Calculator + WYNGS Protective Case Black : Office Products

HP-35S: not a ringing endorsment… HP calculators and space exploration

Hp 35s Scientific Calculator

HP 35s Scientific Calculator – The Stack and the Equation Solver –: Ruland, Frederick: 9798682502486: : Books

HP 35S made in Phillipines -- new variant?

HP Calculators, Hewlett-Packard 35s and 15C scientific calc…