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Melika
@melikafrj
Tunnel building,TBM segment
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Hosna🎩🔮🔵🐹🎭
@hosna
what is this my friend ?can you explain?
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Melika
@melikafrj
A tunnel boring machine (TBM), also known as a "mole", is a machine used to excavate tunnels. Tunnels are excavated through hard rock, wet or dry soil, or sand, each of which requires specialized technology.
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