Despite the efforts of some manufacturers to preempt the market in disposables for themselves, customers do not have to purchase disposable products from the original manufacturer. See Datagate, Inc. v. Hewlett-Packard Co., 60 F.3d 1421, (9th Cir. 1995).  The antitrust and unfair competition laws of the United States forbid suppliers of equipment to engage in coercive conduct to induce customers to use only the manufacturer’s parts or supplies (coercive conduct would include threats by a supplier’s employee not to service a microkeratome, or to delay servicing of a microkeratome). The Supreme Court has held it illegal for a manufacturer to cancel service agreements just because a customer is purchasing parts or supplies manufactured by others. See Eastman Kodak Co. v. Image Technical Services, Inc., 504 U.S. 451 (1992); Jefferson Parish Hospital District No. 2 v. Hyde, 466 U.S. 2 (1984).