I had an Addiator!
My grandfather gave it to me.
It was green (iirc) and much thinner than the one pictured in the above post.
Came with an aluminum stylus, iirc...
Kewl beans!
Geez, thanks for pinging the brain cells - I had forgotten entirely about it!
_-_-bear
http://en.wikipedia.org/wiki/Addiatormine was like the one on the right, but colored differently (ca. 1960)
EDIT: Wait! STOP THE PRESSES!!
This:
http://www.peterkernwein.de/Rechengeraete-Sammlung/addiator_universal.htmIs exactly the same one that I had!! Whooo WHooo!!