File:Beaumont-tunnelbohrmaschine.png

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current20:02, 14 January 2015Thumbnail for version as of 20:02, 14 January 20155,456 × 2,564 (36.66 MB)commons>Opihuck{{Information |Description ={{en|1=A contemporary plan a tunnel boring machine from the 1880s on an idea by Colonel Frederick Beaumont and Thomas English. The tunnel boring machine was 9 meters (30 ft) long and was driven with compressed air.}} {{de...

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