From the July, 1939 Electrical Merchandiser, pg. 40:
"Thermador Ranges,
Thermador Electrical Mfg. Co. Atlantic Blvd and S. Riverside Dr., Los Angeles, CA
A featured model, the Thermador Bilt-In range, presents a new idea in range construction: Surface units, baking oven and warming oven are available in separate units to be built into kitchen fixtures, allowing every unit to be placed in the most convenient location regardless of its relation to other units; for instance the oven may be placed at waist level to avoid stooping." It is not exactly the cooktop in this home, but they were making them in 1939.
Also, on the same page, "Globe Stove and Range Co. Div. of Globe American Corp, Kokomo, Ind. announces Model Dutch Oven model 3231MTL
Selling Features: Dutch oven cooks with retained heat, equipped with cast bottom plate with recessed T-K closed element; spring-seal oven door prevents heat loss; Wilcolator thermostat oven termperature control; automatic timer clockl smokeless broiler in top of oven has 2 broiling positions: High 3400 watts, low 2200 watts; large white utility and warming compartment equipped with 360 watt T-K unit; 2 large utility drawers; three 5 speed T-K surface units and a 6 quart Dutch oven cooker with a 3-speed unit: 625 high, 125 medium and 100 watts low; modernistic louver-light lamp and condiment set; 1-piece white acid resisting porcelain enamel cooking top." SO, They Made Electric Ranges At One Time, not just the gas ranges like the ones for Maytag!
In January, 1939, Barton introduced the Model C8S Controla Speed Washer with three speeds for washing and wringing."changes from one speed to another accomplished by finger-touch control lever on washer skirt."