Brand name: [O on H in diamond] SW
Company: General Refractories Co.
Location: Olive Hill, Kentucky.
Years: 1911-1986+ (brick made)
Description: Brand name impressed into the face. O imprinted on H inside a diamond and SW on the right
side of the diamond logo, all on one line. From the collection of James Freedner.
References: Graves, Jim, Brick Brands of the United States, 2003; Krause, Corinne A., Refractories: The Hidden Industry, American Ceramic
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