The 9 cm PL kanon vz. 12/20 (Anti-aircraft Gun Model 12/20) was a Czech anti-aircraft gun used during World War II. Those weapons captured after the German occupation of Czechoslovakia in March 1939 were taken into Wehrmacht service as the 9 cm Flak M 12(t). Some guns were reportedly captured in Yugoslavia and the Soviet Union as well. Twenty were in Czech service during the Munich Crisis in September 1938. Twelve were in German service between August 1943 and June 1944. According to Nebojša Đokić and Branko Nadoveza "Import of weapons for Army and Navy of Kingdom of SHS and Yugoslavia" 1 battery (4 guns?) were apparently stationed in Bay of Kotor in Kingdom of Yugoslavia (now Montenegro). Same authors in second part of book "Import of weapons for Army and Navy of Kingdom of SHS and Yugosl