US Navy as both a contractor and as a commissioned officer. Kroehl-Olin Families Genealogy on Genealogy.com Court of Common Pleas (NYC), B91, R57 – US Citizenship proceedings United States Patent and Trademark Office (USPTO) Website search United States Bureau of Pensions, Widow's Pension File for Sophia Kroehl, Certificate 5096 General sources Brooklyn Daily Eagle – various articles Chicago Tribune – various articles New York Times – various articles on Diamond Reef, New Orleans campaign and the Pacific Pearl Company. 1820 births 1867 deaths American naval architects Submarine pioneers People from Klaipėda People from East Prussia German emigrants to the United States 19th-century German inventors 19th-century American inventors American marine engineers People from Georgetown (Washington, D.C.)