Pittsburgh Plate Glass Company Building was created in 1910.
Seneca Glass Company Building was created in 1897.
Pittsburgh Plate Glass Enamel Plant was created in 1937.
Jersey Glass Company was created in 1824.
Heisey Glass Company was created in 1895.
White Glass Company was created in 1815.
Sneath Glass Company was created in 1889.
Imperial Glass Company was created in 1903.
Westmoreland Glass Company was created in 1889.
Fenton Art Glass Company was created in 1905.
Fostoria Glass Company was created on 1887-12-15.
Hazel-Atlas Glass Company was created in 1902.
Carr Lowrey Glass Company was created in 1889.