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tunnel boring machine

machine used to excavate circular tunnels through a variety of soil and rock strata

en-US/ˈtʌnəl ˈbɔɹɪŋ məˈʃin/
en-GB/ˈtʌnəl ˈbɔːɹɪŋ məˈʃiːn/

Categories:

heavy equipment