Re:  Reply #s 14 and 17 ...
Where were the CW and CBW manufactured, and in what years were they manufactured?  Did they look very similar to the CB from the outside?  If not, how were they different?
Also, in what colors was the CB2000 manufactured?  I am thinking at least all the colors of the Model 1521s and the accompanying Special Model 1453s, the B-9, B-10, Model 1522s (sand/jade, sand/taupe and blue/fog), and Rug Washers.  
Any info. and pics would be appreciated.
Here is a list of Electrolux commercials (tank and upright) that I have attempted to compose.  Additions and corrections welcome:
1962-1965  C-A
1965-1966  CB (aqua)
1967-1968  CB (tan)
1968-1974  CB (teal)
1974-1978  CB (gold)
1978-1982  CB (brown)
1982-1984  CB2000 (two-toned gray)
1984-1987  CB2000 (sand/jade)
1987-1998 Prolux/1400X (gray)
                   Prolux/1572C
1999-2001 Xtreme (gray body, red hood)
? - ?            Prolux Plus/1572C
? - ?            Prolux Plus/1747
? - ?            Prolux 2000/U136B
? - ?            Commercial/U120A
? - ?            Electrolux Commercial/U129C
? - ?            Lux Commercial/U129Q