The 2009 Inc. 5000: Top 10 Oldest Companies

6 of 10

Rumsey Electric Company, Founded 1895

Rank: No. 3,954
Location: Conshohocken, PA
Revenue: $201.2 million

Founders George and Eugene Rumsey were members of Cornell University's first graduating class in electrical engineering. They launched Rumsey Electric in 1895—just two years after the famously illuminated Chicago World’s Fair—to market their technical expertise as the Northeast began rapidly electrifying.