an Entity references as follows:
This is a list of Swedish destroyers commissioned between 1902 and 1959. The Swedish Navy has once re-numbered all its destroyers. Some ships were assigned hull numbers, which were later changed. Other ships have generally been issued a number, but never wore it. Some destroyers of the Göteborg and Visby classes were rebuilt between 1966–68 and were reclassified as frigates, changing their hull numbers from J to F. No ship has ever had the hull number J15.