1. Communication systems, including: public address and alarm systems, internal communication systems, call phone system, satellite communications, closed circuit television surveillance system (CCTV), private automatic branch exchange (PABX), industrial phones 2. Fire and gas detection system, including: fire detection systems, gas detection systems, industrial audio-visual equipment, audio-visual equipment, explosion-proof 3. The control and instrumentation systems, including: control box, alarm monitoring system, traction chains, tank level measurement system, electrical test bench and so on.

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