Brand name: DURO 1
Company: Harbison-Walker Refractories Co.
Years: 1915-1937+ (brick made)
Type: Acid-proof brick
Description: Brand name "DURO 1" recessed on the face. Wedge-shaped brick is 9 inches long, 4 1/2 inches
wide, 2 1/2-1 7/8 inches thick for the No. 1 wedge.
References: Gurcke, Karl, Bricks and Brickmaking, University of Idaho Press, 1987, p. 228-229;
Graves, Jim, Brick Brands of the United States, 2003; Harbison Walker Refractories Company, Modern
Refractory Practice, Second Edition, 1937.
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