How many movies have Kazuhiko Yamaguchi and Yoshio Nakajima collaborated on?

They have worked on 11 movies together! Their first movie together was Delinquent Girl Boss: Tokyo Drifters (1970) while their highest rated movie together was Karate Warriors (1976). They have not worked together since The Extravagant Cops (1977). They are most known for their action films together.