Klagenfurt Styria formed the British occupation zone in liberated Austria, a state of affairs which lasted until 26 October 1955. In 1961, Klagenfurt became the first city in Austria to adopt a pedestrian zone. The idea of a friendly twinning of cities in other countries that had started with the very first ever city partnership - Klagenfurt and Wiesbaden, Germany, as early as 1930 - was followed up by numerous city partnerships with the result that in 1968 Klagenfurt was honoured with the title of a "European City of the Year". Three times, a European record, Klagenfurt was also awarded the
Test No. 6 a megaton in yield that could be dropped by an aircraft or carried by a ballistic missile. Several explosions to test thermonuclear weapon designs, characteristics and yield boosting preceded the thermonuclear test. Test No. 6 Test No. 6 is the codename for China's first test of a three-staged thermonuclear device and, also its sixth nuclear weapons test. The device was detonated at Lop Nur Test Base, or often dubbed as Lop Nur Nuclear Weapon Test Base, in Malan, Xinjiang, on 17 June 1967. With successful testing of this three-stage thermonuclear device, China became the fourth country to have successfully developed