There are about 5 major domestic manufacturers.
Whirlpool and they make Whirpool,KitchenAid,Roper,Estate,
Maytag makes Maytag,owns Amana,Magic Chef, Admiral(also sold as Mongomery Wards brand),Norge,JennAir..maybe more I forget.
Electrolux-used to be White Consolidated Industries(WCI) Frigidaire,Tappan,Kelvinator,White Westing-House
GE-also makes Hotpoint,RCA,JC Penney brand
Kenmore,Sears brand name can be made by various of the above, the only way to know for sure unless youre a technician and recognize the set up is to decode the model#. For instance on Kenmore washers at the beginning of the model# there will be a 110.xxxxxxxxxx , in this case the 110 being the source code that means Whirlpool is the maker.A link about model#s
http://www.applianceaid.com/model.html
A link about Kenmore model#s
http://www.applianceaid.com/searscodes.html
If you have more questions let me know.
And tell my friend Jeff hello while you're at his site.