MB-19 1940s Blast Furnace (1/87 scale) $46.00 Rated 0 out of 5 HO scale 3 sheets Original furnace built in 1943 in the Pittsburgh district and still in operation. Drawings show the original design with only a few modifications. Smaller than MB-18. Plans and elevations of the furnace, skip hoist, stoves, gas cleaning equipment, piping, stock bins, cast house and ore bridge. Add to cart