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older HP calculators - Katy Brocksmith - 07-06-2017 02:31 PM

I bought two calculators from an instructor. For sure, one is a 28c---it opens kind of like a book with a spine.

Does anyone know if there was ever another calculator that had such a "spine" as a connecting tool to hold two pieces together?

I'm trying hard to remember what the model name was for the other calculator I bought. By the way, this event goes back to 2001 which is why I'm so foggy about the situation.

Much thanks,

RE: older HP calculators - SlideRule - 07-06-2017 02:43 PM

GOOGLE® HP Champion series calculator

19b II (3 variants)


for HP folding models

however, for the sake or full inclusion, other manufacturers also marketed folding {w/ a central spine} calculator(s), both horizontal & vertical.


RE: older HP calculators - striegel - 07-07-2017 12:31 AM

If you want to really appreciate them, you have to see the beautiful images Keith Midson took at https://www.flickr.com/photos/keithmidson/sets/72157630020558518/