Keystone’s Alaskan fleet was combined with BP and Overseas Shipholding Group interests in 1999 as Alaska Tanker Co. On the Great Lakes it operated through Key Lakes as manager of the fleet associated here with United States Steel; Keystone Great Lakes is dated to 1999. Ian Stevenson describes continued Kurz family ownership in 2003. Jan Mertens’s later contribution gives a 1919 foundation and a Keystone Dedicated Logistics connection, differing from the document’s 1909 career history and 1941 Keystone heading.
USA, Philadelphia and Bala-Cynwyd, Pennsylvania.
Keep the explicit scope label independent; no alias or company identity is inferred.