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Topic: chipped teeth

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March 16, 2014 at 11:27 PM

How Bertha chipped her teeth

Photos from Seattle Tunnel Partners’ winter inspections bear witness to the extremely abrasive soils that lurk below downtown Seattle, and perhaps contributed to tunnel machine Bertha’s lengthy stoppage. Project directors have already reported that drill teeth are wearing out and being replaced faster than expected — no mean feat, given that Lynn Peterson, the Washington State Department…


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