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Hello all,

Is there a diagram that shows the lineage of HP calculators. I'm particularly interested in seeing which calcs were the descendants of which. For example, in the 1978 Buying Guide, the HP-31E was advertised as the descendant of the HP-21 (which was the successor to the HP-35).


Edited: 31 Mar 2012, 5:13 p.m.

Uhm, yes, that is sort of available on this site. Just go through the museum pages. At the bottom of each calculator page you find a link to the next and previous one made. Also in the discription you will find which model it replaces or how it relates to others.

José Gonçalves has prepared one:



thank-you for sharing the tree, Gerson

Edited: 31 Mar 2012, 5:56 p.m.


I should have mentioned the author had announced it in this old posting.


Remember that we might like thinking of it this way, but in fact each product is simply a product placed in the marketplace. IT may have been observed to follow a pattern (e.g. 11c 32s 32sii 33s 35s) and we might have some anecdotes, but really, there is no actual family tree :-)


Yep, you are correct. The family tree itself shows a reverse natural pattern (wow! RNP...): the tree comes after its fruits.


Luiz (Brazil)

Edited: 31 Mar 2012, 8:01 p.m.

Now, THAT'S a tree! You're right! I'm enjoying this!! Funny thing--as I'm looking for the codenames, I didn't realise that those are in the 'Collector's Corner' section here.

Edited: 31 Mar 2012, 9:55 p.m.

In Italy we say : "è nato prima l'uovo o la gallina?", it means : was born, first, the egg or the hen?