Comcast, the philadelphia cable-television giant, must be the only media powerhouse that owes its start to beltless pants. Ralph Roberts was running a belt-and-cuff-links business when he saw something alarming: an ad for slacks that didn't need a belt to stay up. Roberts already knew cuff links were history. Fleeing the belt-less revolution, he sold the company and bought a cable franchise in Tupelo, Miss., in 1963. During the next few decades, he and his son Brian built that tiny system into the nation s third-largest cable-TV company.
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