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older HP calculators
07-06-2017, 02:31 PM
Post: #1
older HP calculators
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,
katyb
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07-06-2017, 02:43 PM (This post was last modified: 07-06-2017 02:46 PM by SlideRule.)
Post: #2
RE: older HP calculators
GOOGLE® HP Champion series calculator

18c
19b
19b II (3 variants)

28c
28s

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.

BEST!
SlideRule
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07-07-2017, 12:31 AM
Post: #3
RE: older HP calculators
If you want to really appreciate them, you have to see the beautiful images Keith Midson took at https://www.flickr.com/photos/keithmidso...020558518/


Alan
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