 Complete the following phrase:  Ullring was born in Horten to Ole Edvard Ullring and Svenda Fogelstrøm, and graduated as naval officer in 1916. He invented a series of naval instruments, including the direction finder called Ullrings peileskive. During the Norwegian Campaign in 1940 he was in command of the destroyer HNoMS Sleipner, and he served as military governor of Svalbard 19421943. In 1944 and 1945 he served as commodore at the Royal Naval Reserve, and was involved in the Battle of the Atlantic, including the 