Duncan & Miller Glass Company was a well-known glass manufacturing company in Washington, Pennsylvania. Items that were produced by the company are known as "Duncan glass" or "Duncan Miller glass." The company was founded in 1865 by George Duncan with his two sons and son-in-law in the South Side neighborhood of Pittsburgh, Pennsylvania. By 1890, the company joined other glass companies to form the United States Glass Company, a powerful glass trust. In 1892, the factory was destroyed in a fire, and the company was relieved of its trust relationship with the US Glass Company. After the fire, the second generation of the Duncan family moved operations to Washington, Pennsylvania. In 1900, John Ernest Miller, the company's long-time designer, became a full shareholder along with members of t