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Patent Reviews: 5,767,998; 5,768,000; 5,784,170; 5,784,184; 5,796,501; 5,798,853; 5,812,306; 5,898,183; 5,898,502; 5,898,519; 5,903,000; 5,905,270; 5,905,567; 5,905,570; 5,905,808 5,906,429