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The 37 mm kanón P.U.V. vz. 37 made by Skoda Works for the czechoslovakian army between 1936 and 1939. The yugoslavian army also bought this AT gun from Skoda.
Later the Wehrmact salvaged a lot of guns from Czechoslovakia /renamed to 3,7cm PaK 37(t)/ and Yugoslavia /renamed to 3,7cm PaK 156(j)/. The Royal Hungarian Army salvaged a few guns from Yugoslavia in 1941.