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Tunnel Technologies's files
Korea ADD Tunnel Robot
By Ji-Yu DokoKorea ADD (Agency for Defence Development) Tunnel Robot photo copyright ADD
Patent doc: Method And Apparatus For Tunneling By Melting
By Tim AltmanUS Patent from 1972: Method And Apparatus For Tunneling By Melting
Ad Dar Al Bayda, Morocco
By Abbas ShakirAd Dar Al Bayda ("Casablanca"), Morocco image author Aymane fahssi via Wikimedia Commons
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cover tunnel photo by: Matt Brown from London, England / CC BY
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