Hewlett-Packard 34C Calculator

1980 Hewlett Packard HP-33C, 34C and 38C Calculators Ad on eBid United States

I restored a beautiful HP-33E from 1979 : r/calculators

Review: HP 35s Programmable Scientific Calculator

HP Classic Calculator Emulator

HP-39GS GRAPHING CALCULATOR - Hewlett-Packard - Open Box - Rare in Box £76.04 - PicClick UK

HP calculators - Wikipedia

HEWLETT PACKARD HP-12C - Vintage Finance Calculator - w/case, Handbook, Guide £15.19 - PicClick UK

File:Vintage Hewlett-Packard Model HP-38C Electronic Programmable Pocket Calculator, Red LED Display, Sealed Battery Pack, Made In USA, Circa 1979 (14548750048).jpg - Wikimedia Commons

The Berkeley Remix Podcast, Season 4, Episode 2, “Berkeley Lightning: A Public University's Role in the Rise of Silicon Valley” - UC Berkeley Library Update

Hewlett-Packard HP-33C Handheld Electronic Calculator

Hewlett Packard. They're ready when you are. 1980. : r/vintageads