First Addition HP-42S Scientific Calculator with Case

Hewlett Packard HP42S RPN Scientific Calculator With Slip Case.

HP 42S RPN Scientific Calculator with a Case

Vintage Hewlett Packard HP 15C RPN Scientific Calculator USA - Tested

HP 15C CE RPN Collector’s Edition Scientific Calculator

Hewlett-Packard HP 16C Scientific Calculator with Case - TESTED & WORKING - EUC

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Hewlett-Packard HP-16C Programmers Calculator w/Case/New Batteries - Tested