My own collection of the HP Calculators. The HP 21 was my very first Hewlett-Packard calculator. Here sorted by its number with HP 15C as most recent addition:
HP 21 Second Generation HP-35
My own collection of the HP Calculators. The HP 21 was my very first Hewlett-Packard calculator. Here sorted by its number with HP 15C as most recent addition:
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