12. Royalties shall continue only during the life of said patent Number 1,628,657, and when a total of Two Hundred Fifty Thousand Dollars ($250,000.00) has been paid by Licensee to Licensor, all royalties shall cease and the license hereunder shall be free thereafter. 13. Licensor agrees that Licensee shall have the benefit of any more favorable royalty rates that may be hereafter granted to or enjoyed by any other manufacturer of engines other than aircraft engines. 14. Licensee agrees to keep proper books of account showing the number of engines manufactured and sold or used under this agreement and to report quarterly to Licensor. 15. In case of suit against the Licensee for infringement of patents by any of the Dorner features built under this license Licensor agrees to assist in the defense of any such suit and pay the expenses thereof up to an amount equal to Ten Percent (10%) of all royalties paid by Licensee to Licensor hereunder. 16. In event of default of the Licensee in the payment of any of the sums herein provided for, Licensor may terminate this license agreement by serving upon the Licensee Sixty (60) days' notice in writing of its desire and determination so to do and stating the default upon which the notice is based, and at the expiration of such Sixty (60) days this license shall thereupon be terminated, provided however that such termination shall not release the Licensee from obligations already accrued hereunder and not performed, and provided further that if, during said Sixty (60) days' notice period, the default named in said notice shall have been made good then this license to continue as if no default and notice had been made or given. 17. At the expiration of any one year from November 1, 1929, Licensee may terminate this agreement upon Sixty (60) days' notice in writing to Licensor of its desire and determination so to do, provided however, that such termination shall not release the Licensee from obligations already accrued hereunder and not performed. 18. In case of differences of opinion regarding any of the terms of this agreement, the dispute shall be submitted to arbitration. Each party shall select one arbitrator and if they, after five days, fail to agree upon a third, the United States Court for the Detroit District shall be asked to appoint such a third arbitrator, and the decision of a majority of the arbitrators shall be binding upon both parties. In witness whereof, we have hereto set our hands and seals at Detroit, Michigan, on the day and year first above written. Witnesses--(Signatures): Hermann Dorner L. A. Wright Adolf Widmann PACKARD MOTOR CAR COMPANY Alvan Macauley President (Seal) Attest: Milton Tibbetts Assistant Secretary 2. Packard to Begin Building Diesel Plane Engines Soon _Will Start Construction at Once on New Three Story Factory to Handle Work_ [From _Aviation_, March 2, 1929, vol. 26, no. 10]