How many movies have G. D. Joshi and N.T. Rama Rao collaborated on?

They have worked on 4 movies together! Their first movie together was Parivartana (1954) while their highest rated movie together was Panduranga Mahatyam (1957). They have not worked together since Sri Tirupati Venkateswara Kalyanam (1979). They are most known for their drama films together.