| 11. | More recent projects use tunnel boring machines, which increase the cost.
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| 12. | The tunnels will be created using a tunnel boring machine.
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| 13. | This method of excavation contrasted with the tunnel-boring machines used elsewhere in the city.
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| 14. | The supply and assembling of the two tunnel boring machines took approximately a year.
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| 15. | His boring machine has been called the first machine tool.
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| 16. | Some of the sections under the airport required the use of a tunnel boring machine.
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| 17. | A Tunnel boring machine was used for the construction.
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| 18. | A horizontal boring machine has its work spindle parallel to the ground and work table.
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| 19. | The water damaged two of the four tunnel boring machines, but no workers were injured.
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| 20. | Tunnel boring machines for the project were launched from the north end near Hoffman Construction.
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