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At the tunnel excavation construction site, we have started operating the latest entry and exit + location recognition system. In a tunnel approximately 3 km long, with 20 relay stations in the network, the system automatically recognizes the entry and exit of workers and their positions within the tunnel. We will be expanding the wireless network while continuing excavation. The update of the wireless network is automatically recognized with a power reset, and network failures are automatically rerouted, achieving stability and reliability through a monitoring function that identifies the failure points. Additionally, we have introduced a function to notify each worker of their overtime hours in response to the new regulations on overtime limits. In the future, we plan to install battery-operated ultra-small sensors for temperature, vibration, and atmospheric pressure on-site to add environmental monitoring. *To help you experience the convenience and reliability of the wireless network, we are offering free rentals of each device.