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 Address to refer: https://www.researchchannel.co.za/article/range-of-shaft-boring-equipment-developed-to-go-deeper-2016-06-03
 Article Headline: German company develops four machines for blind-shaft construction, enlargement
 Abstract: German mechanised tunnelling engineering company Herrenknecht AG has developed a range of four shaft boring machines for the safe and rapid construction of blind shafts or shaft enlargements to a depth of 2 000 m.
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