How many movies have Mamoru Oshii and Ryusuke Ohbayashi collaborated on?

They have worked on 4 movies together! Their first movie together was Patlabor: The Movie (1989) while their highest rated movie together was Patlabor 2: The Movie (1993). They have not worked together since Out-of-range Woman (Director's Cut) (2008). They are most known for their action films together.