| http://www.w3.org/ns/prov#value | - It stems from a challenge proposed to the company five years ago by Boeing and GKN. The companies were increasingly working with blocks of lightweight, high-strength, corrosion-resistant materials that are difficult to machine, such as titanium. ???They would be roughing the material and the cutting tool would pull out of the toolholder, even with milling chucks, press-fit systems, hydraulic chuck
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