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Chinese workers operate a drilling jumbo to drill the Taiyangwan Tunnel of the Zhengwan High-speed Railway in Yunyang county, Chongqing, China, 4 Dece Stock Photo - Alamy
Sandvik Introduces New Tunneling Jumbo
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Brazilian port tunnel sets new standards
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1959 : REEL's "Jumbo" dig the Mont-Blanc tunnel - REEL International
