United States Glass Company (Pittsburgh-PA, Company Operated: 1891-1962) - Pittsburgh-PA
• Notes: Chartered early 1891. Member factories became known by letter designation. Factory: (A)Adams & Co (B)Bryce Brothers (C)Challinor, Taylor & Co (D)George Duncan & Sons (E)Richards & Hartley (F)Ripley & Co (G)Gillinder & Sons (H)Hobbs Class Co (J)Columbia Glass Co (K)King, Son & Co (L)O'Hara Glass Co (M)Bellaire Goblet Co (N)Nickel Plate Glass Co (O)Central Glass Co (P)Doyle & Co (R)A.J.Beatty & Sons-Tiffin (S)A.J.Beatty & Sons-Steubenville (T)Novelty Glass Co
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