Mergers and acquisitions

12/19Multiple targetsPatterson Companies Inc.Patterson's dental supply unit acquired Chatsworth, Calif.Mendota HeightsDolphin Imaging Systems and Dolphin Practice Management, providers of 3D imaging and practice management software for specialized dental practitioners. 12/21Radi Medical Systems ABSt. Jude Medical Inc.St. Jude completed its acquisition of Radi Uppsala, SwedenLittle CanadaMedical Systems AB for $250 million in cash. Radi makes cardiovascular devices in two market segments in which St. Jude does not participate. 12/22MediGuide Inc.St. Jude Medical Inc.St. Jude acquired MediGuide Inc. for Haifa, IsraelLittle Canada$283 million in cash and the assumption of $17 million in liabilities. 12/23RT/Dygert International Inc.Diploma Plc.Diploma Plc. acquired the business, assets MinneapolisLondonand goodwill of RT/Dygert International Inc., a supplier of seals, o-rings and custom molded and machined parts, for $13.9 million. 12/23Anderson Power and Titan Machinery Inc.Titan Machinery acquired Anderson Power and EquipmentFargo, N.D.Equipment, an agricultural equipment dealer. Thief River Falls, Minn. 12/23Multiple targets Arthur J. Gallagher & Co.Arthur J. Gallagher acquired Stanton Group, MinneapolisItasca, Ill.an employee benefit broker, and Stanton Group Risk Management Services, a retail insurance broker, both based in Minneapolis. 12/23Tundra Particle Technologies North American TungstenNorth American Tungsten formed a joint MinnesotaCorp.venture with Tundra Particle Technologies to Vancouver, B.C.produce tungsten powders and intermediates from low-grade concentrates. 12/24Repose GAHM product line Medtronic Inc.Medtronic acquired InfluENT Medical's Concord, N.H.FridleyRepose GAHM product line for treatment of obstructive sleep apnea.