How many movies have Pingali Nagendra Rao and Relangi Venkata Ramaiah collaborated on?

They have worked on 7 movies together! Their first movie together was Vindhya Rani (1948) while their highest rated movie together was Pathala Bhairavi (1951). They have not worked together since Mahamantri Thimmarusu (1962). They are most known for their drama films together.