Model Catalog: TRILOGY (Lot serial: >10 serial numbers.); Model Catalog: TRILOGY (Lot serial: Contact manufacturer.); Model Catalog: 2100C (Lot serial: >10 Serial numbers.); Model Catalog: 23EX (Lot serial: H271208); Model Catalog: 2100C (Lot serial: Contact manufacturer.); Model Catalog: 21EX (Lot serial: Contact manufacturer.); Model Catalog: 21EX (Lot serial: >10 Serial numbers.); Model Catalog: NOVALIS TX (Lot serial: H271992); Model Catalog: 6EX (Lot serial: Contact manufacturer.); Model Catalog: 600C (Lot serial: Contact manufacturer.); Model Catalog: 6EX (Lot serial: >10 Serial numbers.); Model Catalog: 600C (Lot serial: >10 Serial numbers.); Model Catalog: CLINAC IX (Lot serial: Contact manufacturer.); Model Catalog: CLINAC IX (Lot serial: >10 serial numbers.)