| Brand | HP |
|---|---|
| Model | Hewlett Packard HP 28S Advanced |
| Country of Origin | usa |
| Vintage | Yes |
Check the listing for details. Hewlett Packard HP 28S Advanced Scientific Calculator - RPL, Tested Working. Condition: Used, Made in usa. Listed at 60.00 USD. Up for sale is a working HP 28S — the groundbreaking 1988 clamshell scientific calculator that introduced Reverse Polish LISP (RPL) and was the first pocket calculator capable of symbolic mathematics.
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