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27 Communications
27.01.00 Operation and Maintenance of Communications Systems 27.05.00 Common Work Results for Communications 27.06.00 Schedules for Communications 27.08.00 Commissioning of Communications 27.10.00 Structured Cabling 27.20.00 Data Communications 27.30.00 Voice Communications 27.40.00 Audio-Video Communications 27.50.00 Distributed Communications and Monitoring Systems
