How many movies have S. V. Ranga Rao and Tatineni Prakash Rao collaborated on?

They have worked on 4 movies together! Their first movie together was Palletooru (1952) while their highest rated movie together was Charana Daasi (1956). They have not worked together since Kaathiruntha Kangal (1962). They are most known for their drama films together.