I was bored and found a HP-27S

[Eric Rechlin]

The 32S was indeed Leonardo. The 22S was actually Plato; DaVinci was the 42S.

Thanks for the time you put into those manuals. You can now see them preserved forever here:

Science Student Applications for the HP-22S: https://literature.hpcalc.org/items/1149

Technical Applications for the 27S and 19B: https://literature.hpcalc.org/items/1143