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We have, however, declined to apply the doctrine of prosecution disclaimer where the alleged disavowal of claim scope is ambiguous. For instance, in Northern Telecom Ltd. v. Samsung Electronics Company, 215 F.3d 1281, 1293-95, 55 USPQ2d 1065, 1074-75 (Fed.Cir.2000), the accused infringer relied on remarks made by the inventors to overcome a rejection as the [ ]