Next time you're sitting in your car waiting for the green light, consider that the colored lenses in the traffic signal may have been made in Swissvale, Pennsylvania.

Kopp manufactures custom, hand-molded glass parts for a wide range of products.  They make lenses, domes, and filters for aircraft, railroad, and marine lighting. One of Kopp’s filters absorbs the heat of the light source.  Usually this filter is found in light fixtures used by medical professionals and dentists.

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