How many movies have José G. Jara and Salvador Lozano Mena collaborated on?

They have worked on 4 movies together! Their first movie together was El diario de mi madre (1957) while their highest rated movie together was This Was Pancho Villa: Third chapter (1958). They have not worked together since The Hanged Man's Ghost vs. The Black Whip (1959). They are most known for their action films together.