This is a little hard to explain. The first season of Hazel was 1961. This morning I caught episode 23 of the first season, Dorothy's Birthday. In a couple of scenes, Hazel walks from the kitchen to her room and in so doing, walks past the open door to the laundry room and in there is the original Duomatic with the knob in the center of the door. As the series went on, the kitchen underwent some equipment changes. Part of this appliance changing was a 1958 Duomatic and a Philco electric range. It's strange that the older combos were featured, even when the American Gas Association was taking credit for the kitchen appliances.