File:Fig 06 - Electric Hoist Traveler, Tunnel No. 4, South End.jpg
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![File:Fig 06 - Electric Hoist Traveler, Tunnel No. 4, South End.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e0/Fig_06_-_Electric_Hoist_Traveler%2C_Tunnel_No._4%2C_South_End.jpg/800px-Fig_06_-_Electric_Hoist_Traveler%2C_Tunnel_No._4%2C_South_End.jpg?20180520062148)
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