skos:altLabel | - Harlequin
- Westlake
- Whitford
- PPG
- Vitro
- Canadian Pittsburgh Industries
- PPG Envirobase High Performance
- PPG Glass Industries
- PPG Industries, Inc.
- PPG Paints
- PPG Industries
- Pennsylvania P.G. Co.
- Pittsburgh Paint Company
- Pittsburgh Paints
- Pittsburgh Plate Glass
- Pittsburgh Plate Glass Co.
- Pittsburgh Plate Glass Company
- Pittsburgh Plate Glass Company (now PPG Industries, Inc.)
|