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    • Ray M. Morgan

      A Tribute to Big Bertha: A 25,000 HP Mechanical Worm Designed in Japan for American Drilling. https://www.autoevolution.com/news/big-bertha-a-25000-hp-mechanical-worm-designed-in-japan-for-american-drilling-139612.html #HitachiZosen #BigBertha

      Tags: HitachiZosen, BigBertha

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