Bertha (tunnel boring machine) - WikipediaBertha, also known as Big Bertha, is a 57-foot-diameter (17.4 m) tunnel boring machine built . In March 2016, regional transit agency Sound Transit decided to drop names for its own tunnel boring machines, used for smaller light rail tunnels,.berthe equipment and machine,World Equipment & Machine Sales Co.: WelcomeActs as broker for disposal of used and surplus foundry equipment. Services include appraisals, liquidations, and auction and consignment sales. Details of.
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