DONALDSON <DCI> TO BUY MINE SAFETY <MNES> UNIT Donaldson Co Inc said it reached an agreement to buy the assets of the Filter Products Division of Mine safety Appliances Co for undisclosed terms. It said Filter Products will operate as part of Donaldson's Industrial Group and its manufacturing operations will be relocated to Dixon, Ill., from Evans City, Pa. Donaldson said the acquisition complements its microfiltration business and internal research and development efforts.