The Model B-21 triple brush "Floor & Rug Conditioner" was manufactured from 1968-1973 by Electrolux (Canada) Ltd., which is now called Aerus Canada, Inc.  It is a division of Aerus LLC, headquartered in Dallas, Texas.  Stores are located throughout the USA and Canada.  You may obtain a free copy of manual by requesting it from Aerus.  Contact information may be found at  aerusvacuums.com.  Regards.