This purchase order is placed on the basis of the terms and conditions herein contained and no variation or alteration thereof shall have any effect or bind the Buyer unless agreed in writing by the Buyer. These terms and condition shall constitute the entire agreement and supersede all prior proposals, negotiations and correspondence. Buyer objects to the inclusion of any other or additional terms by Seller in Seller’s acceptance of this purchase order. If Seller includes or attaches any other or additional terms in Seller’s acceptance or purported acceptance or commences performance or tenders the goods or services, a contract of sale result upon Buyer’s terms and conditions as stated herein, without inclusion of any other or additional terms or conditions.