Champion Series
Vintage 1986 Hewlett Packard HP 28S Advanced Scientific Calculator | eBay
HP-28C/S
Duracell MN9100 Battery for HP-19B, HP-19BII, HP-18C, HP-28, HP-28S - Pack of 2 | eBay
HP-28S Battery Compartment Door – TeaWea – Calculators
HP 28S LiPo Battery | Hackaday.io
HP 28S - A solution for battery and broken sliding door
Hacker In Harrison 🐗 on Twitter: "I've got an old Hewlett-Packard HP-28S that needs a battery cover. I've replaced the calculator with a HP-35S but I'd like to get this old one
Hewlett-Packard HP-28C Handheld Electronic Calculator | National Museum of American History
HP Forums - HP 19BII battery door on back: how rare is it really?
HP 19B II 19BII HP Business Consultant II Calculator 3D Print Battery Back Door | eBay
Anyone have a photo of a broken HP28S battery cover?
HP 28S Scientific Calculator for sale online | eBay
Broken HP 28S battery cover repaired with brass sheet
HP-28 series - Wikipedia
HP-28S Battery Compartment Door – TeaWea – Calculators
The HP 28S programmable calculator
Hewlett-Packard HP-28S Handheld Electronic Calculator | National Museum of American History
Hewlett-Packard HP-28C Handheld Electronic Calculator | National Museum of American History
HP-28S Battery Compartment Door – TeaWea – Calculators
HP-28S Battery Compartment Door – TeaWea – Calculators
LOT OF 2 Calculator HP 28S advanced Scientific and HP 19BII Business Consultant | eBay
HP-28S
Hacker In Harrison 🐗 on Twitter: "I've got an old Hewlett-Packard HP-28S that needs a battery cover. I've replaced the calculator with a HP-35S but I'd like to get this old one
HP-28 series - Wikipedia
Champion Series
Order the HP-28S Battery Compartment Lid – TeaWea
HP 28S - A solution for battery and broken sliding door
