They used one of these to dig the new tunnel under Seattle. Know what stopped it dead in it’s tracks? A very old 6 inch diameter cast iron pipe. It was down for several days.
That’s when cast iron was CAST IRON.
They used one of these to dig the new tunnel under Seattle. Know what stopped it dead in it’s tracks? A very old 6 inch diameter cast iron pipe. It was down for several days.
That’s when cast iron was CAST IRON.