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Glass Manufacturers
Armstrong Glass Company - Produces hand mixed art glass.
Bullseye Glass Co. - Bullseye specializes in fusible glass and art glass.
Kokomo Opalescent Glass - Kokomo prduces brilliant colors for use in stained glass works.
Spectrum Glass Company - Spectrum glass is machine made and is known for it's constistent quality and cutability.  They also offer free stained glass patterns on their web site.
Uroboros Glass Studios - Uroboros specializes in beautiful art glass and fusible glass.
The Paul Wissmach Glass Company - Produces a large variety of colors for stained glass.
Youghougheny Glass Co. - Youghiogheny produces wonderful Tiffany reproduction and other art glass.  They have also taken on manufacturing of Oceana brand glass.