. . "By: SteveZee On: Sun Sep 30, 2012 9:25 am McGiever wrote:It looks to be a Heatroal Type unitReading the link provided by the OP, Marshall-Wells was a hardware retailer, among other things.Possible they were not the manufacture of that Heatrola, as other retailer of the time also had Heatrolas in the inventories and those units too bared the retailers name, i.e. Sears Roebucks, Montgomery Ward etc." . .