How many movies have Hartmut Bitomsky and Harun Farocki collaborated on?

They have worked on 4 movies together! Their first movie together was Zum Begriff des 'kritischen Kommunismus' bei Antonio Labriola (1843-1904) (1970) and was their highest rated movie together. They have not worked together since Putting Things Straight (1979). They are most known for their drama films together.