Variable Speed Models: CFE28, CWE23, CYE22, GYE22, PFE28, PWE23, PYE22, ZWE23 Single Speed Models: DFE28, DFE29, GFE26, GFE27, GFE28, GFE29, GNE26, GNE29 PUBs 31-51901 and 31-51895