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.
Sneath Glass Company was created in 1889.
Heisey Glass Company was created in 1895.
Jersey Glass Company was created in 1824.
Imperial Glass Company was created in 1903.
Westmoreland Glass Company was created in 1889.
White Glass Company was created in 1815.
Carr Lowrey Glass Company was created in 1889.
Worshipful Company of Glass Sellers was created in 1664.
New Martinsville Glass Company was created in 1901.
Fenton Art Glass Company was created in 1905.