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Hewlett-Packard

Bill Hewlett and Dave Packard both graduated from Stanford University with electrical engineering degrees. In 1939, with $538, they founded a business run out of a garage and manufactured their first product, a sound-equipment tester.

One of their first customers was Walt Disney Studios, which used the oscillator on speaker systems in theaters showing the movie "Fantasia," according to Reuters.

"We were here with electronic products when electronics became a big thing," Hewlett said in 1946. "We don't deserve one damn bit of credit for the success of Hewlett-Packard."

The company entered the Fortune 500 in 1962.

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