Road traffic signal equipment. Emergency roadside telephones. Part 4: Transmission by optical fiber. Functional specifications and technical characteristics.
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Road traffic signal equipment. Emergency roadside telephones. Part 4: Transmission by optical fiber. Functional specifications and technical characteristics.
Road traffic signal equipment. Emergency roadside telephones. Part 4: Transmission by optical fiber. Functional specifications and technical characteristics.
Road traffic signal equipment. Emergency roadside telephones. Part 4: Transmission by optical fiber. Functional specifications and technical characteristics.