Presenting your collection of non HP calculators, is anyone interested of that?

[Benjer]

I've got a Sharp EL-5200 graphing calculator with a form factor not unlike that of the HP-28. I believe it's Sharp's first graphing calculator and it might even be the second one to market after Casio. It has an unassuming appearance when 'closed':



Has a lot going on inside, though:



Took me a while to find a manual for it and there were several functions I just couldn't figure out until then.

I've got more slide rules than I can shake a stick at. One of my more unusual ones is a Keuffel & Esser Analon, designed to perform dimensional analysis (e.g., divide 'distance' by 'time' and get 'velocity'). It's a treat to look at with all its various symbols and letters. It was one of the last slide rules designed by K+E and was not successful at all. They stopped making slides pretty soon thereafter.