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2012-12-2 · One of Japan's longest tunnels has collapsed, trapping vehicles amid reports that at least five people have died.Sections of concrete fell from the ceiling of the Sasago tunnel, 50 miles west of . jaw crusher working principle
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2021-5-1 · Introduction. Mountain tunnels and underwater tunnels play an important role in transportation infrastructures , , , , such as the world’s longest mountain tunnel, the Gotthard rail base Tunnel in Switzerland , and the world’s longest submarine tunnel, the Seikan Tunnel in Japan . large bentonite jaw-type crushing machine in tunisia manufacturer.As a mountainous and river-rich country, China had more than 16,000 highway tunnels and more than 14,000 . small jaw crusher working principle from tunisia
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