Communication terminal device, communication system, and communication method used by workers undertaking dangerous operations
Abstract:
A first communication unit communicates with a first communication terminal device by using a first communication scheme. A second communication unit communicates with a second communication terminal device by using a second communication scheme capable of communication over a longer distance than the first communication scheme. A search instruction communicating unit communicates a search instruction to the second communication terminal device via the second communication unit, the search instruction including an identifier identifying a first communication terminal device, and instructing the second communication terminal device to search for the first communication terminal device by using the first communication scheme.
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