For many years, Sears Kenmore ranges were made by Roper - gas in Kankakee, IL, and electric in Newark, OH. Whirlpool bought Roper in 1988. However, the Roper manufacturing facilities (in La Fayette, GA by this point in time) were sold to GE, with Whirlpool retaining the rights to the Roper name.
In addition, some Sears ranges (especially 40" electric) in the 60's and 70's were sourced through Whirlpool, but actually were made in the Kelvinator factory.