The Electrolux Ambassador-series cylinder cleaners was manufactured from circa 1989-2000 with the names:  Ambassador, Ambassador II, Ambassador Plus, and Ambassador III (if it has a coronet graphic on the cleaner's name decal the Roman numerals will be inside it).  Electrolux Corporation, now called Aerus LLC, was the manufacture.  To obtain a free electronic copy of the manual visit Aerus's website at aerusvacuums.com, click on the Support tab, select the Download Manuals hyperlink, then choose the manual you need from the Older Models menu.  Regards.