Offer Valid: 1/1/13 - 6/30/13 Buy 3 Midwest Turbines, Get 1 of the same Free! Free goods are of equal or lesser value. To receive your free good, mail a copy of your Patterson invoice to Dentsply, Attn: 3rd/4th Quarter Offers, 1301 Smile Way, York, PA 17404 or fax to 800-278-4344. Offers must be redeemed by 7/31/13. Limit 5 redemptions of each offer per doctor. These offers may not be combined with any other Dentsply offers or contract agreements.