the losses subject to compensation shall be the necessary expenses incurred for manufacture of and procurement of materials for,and the undepreciated expenses of special molds,jigs and tools used for , the finished products and products in progress under this agreement and the individual contracts and held at the time of the receipt by TI of the notice of changes;provided,however , that TI shall make its utmost efforts to utilize such products for other intended purpose and otherwise try to minimize its losses