Note 1679 — ARTICLE I (continued 7)

See also Puget Sound Traction, Light & P. Co. v. Reynolds, 244 U.S. 574 (1917). "Before we can find impairment of a contract we must find an obligation of the contract which has been impaired. Since the contract here relied upon is one between a political subdivision of a state and private individuals, settled principles of construction require that the obligation alleged to have been impaired be clearly and unequivocally expressed." Justice Black for the Court in Keefe v. Clark, 322 U.S. 393, 396-397 (1944).