Description
The classic Hewlett Packard RPN (Reverse Polish Notation) calculators.
- HP-35, HP-45. First pocket scientific calculators (1972). HP-21. 2nd gen of the HP-35 (1975)
- ЭЛЕКТРОНИКА MK 61. Soviet RPN Calculator (USSR - Ukraine) late 70's
App information from Apple App Store. HP-35 and related trademarks belong to Enrique Haro.