Keystone Technologies
Keystone Technologies was founded 75 years ago by brothers Marvin Spielman and Harold Fox returning home from World War II. Fluorescent lamps had just become a popular energy-efficient alternative to incandescent lamps, so these two budding entrepreneurs founded Keystone at A and Cortlandt Streets in Philadelphia to focus on manufacturing ballasts and transformers. At the time, several major fixture manufacturers in the lighting industry called Philadelphia home: Keystone Lighting, Simkar, Crescent Lighting, Progress Lighting, and Sea Gull Lighting. Keystone quickly became a strategic supplier for their ballast and transformer needs.