(Home Appliances) Furnace Advertising Covers. Balance of 40 illustrated ad covers, 1870-90's; host of furnace designs with products and companies including The Dunning Patent Florida Boilers, W.B. Geddes Monitor Furnaces, Abram Cox Stove Co. - Philadelphia, Pa. (2 different), Criterion Duplex Furnace - New York City, Ruttan Tublar Furnace (2 different), etc.; some flaws, Very Fine overall. Estimate  $600 - 800. $0 (Image)