The New London Ship and Engine Company (NELSECO) was established in Groton, Connecticut as a subsidiary of the Electric Boat Company to manufacture diesel engines.[1]
History
Electric Boat acquired a license to manufacture MAN diesels, approximately in the year 1909. These were initially manufactured by the Fore River Shipyard of Quincy, Massachusetts, where most of Electric Boat's early submarines were built under subcontract. NELSECO was established in Groton to take over diesel manufacturing from Fore River when difficulties were encountered, finishing the work on engines begun by Fore River. It was a subsidiary of the Electric Boat Company for its entire existence. The E- and F-class submarines, launched 1911–12, were initially equipped with these diesels; they were replaced in 1915 as NELSECO's initial efforts were unsatisfactory.[2]