I don't know anything about the Hitachi, but I own both a Bison Centurion and an Electrolux model 60 (commonly referred to as an LX). What are you looking to find out on them?
I found the information on the Electrolux LX. I just need information on the other two like when and where were they made; company history, dates built; any links to advertising. Any help you can give would be greatly appreciated. Barb