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EFS40 SWITCHING UNIT 3/5 TUBE 071-00074-0300SU 463 Switching Unit | For EFS40, 3/5 TubeThe SU 463 Switching Unit gives the EFS 40 system the ability to select different reversionary modes. Version 071-00074-0300 is a 3/5-tube switchActive and Requested Mode functions: Display downCompositeStandbyDis..