Transition: Barry Gump (right) is preparing to retire as head of Andy Gump Inc. and turn the reins over to daughter, Nancy. Barry’s father started the firm in the 1940s.

Transition: Barry Gump (right) is preparing to retire as head of Andy Gump Inc. and turn the reins over to daughter, Nancy. Barry’s father started the firm in the 1940s.

For 65 years, the Gump family’s business has been in the toilet: portable toilets, that is...

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