Sean Murphy, founder of a Bradenton-based fence company with 12 offices in four states, spends most of his working days in constant motion, a cross between a hands-on problem solver and a big-picture visionary.He's been known to get in his truck and drive to a company facility in Charlotte, N.C. or suburban Nashville, Tenn. to handle a customer situation. But he's also been to known to come up with ideas that can turn into company revenue-boosters.