In the Polish Air Force, Yak-12s (transcribed in Poland as Jak-12) were used from 1951, as liaison, patrol and general utility planes. Most were withdrawn in the 1970s, the last in the 1980s. In the Polish civilian aviation they were used from 1952, in bigger numbers from 1956. They were used in aeroclubs and as flying ambulances.
is inaccurate. I can testify myself that the planes are still actively used for parachute training.