As the oldest mechanical contractor in Indiana, A. Hattersley & Sons has persevered through significant historical challenges, including the U.S. Civil War, both World Wars, the Great Depression, and the expansion of the nation with the addition of twenty-seven states. Over its 170+ years, the company has adapted to changing economic conditions and technological advancements, all while maintaining its reputation for reliability and craftsmanship. In 1856, Alfred Hattersley, an English immigrant, acquired the plumbing and gas-fitting firm of B.W. Oakley & Son. He relocated the business to Main Street, near the present-day Allen County Courthouse. Early on, Hattersley embraced emerging technologies by installing a steam engine in his machine shop, where valves cast in his foundry were finished. The firm originally offered plumbing, heating, electrical services, and terrazzo flooring. At first, much of the business revolved around installing cisterns and wells. However, the construction of a city waterworks system shifted demand toward indoor plumbing, creating new opportunities for growth. Hattersley’s sons, Byron, later joined by Willis and Alfred, continued the family legacy. By