How many movies have Aarre Koivisto and Vihtori Välimäki collaborated on?

They have worked on 4 movies together! Their first movie together was Pekka ja Pätkä lumimiehen jäljillä (1954) while their highest rated movie together was Pekka ja Pätkä ketjukolarissa (1957). They have not worked together since Pekka ja Pätkä neekereinä (1960). They are most known for their comedy films together.