| http://www.w3.org/ns/prov#value | - Moreover, in order to solve the problem, it is preferable to attach the mandrel even during machining, but in this case, the product adheres to the mandrel by the matrix in the CVI or PIP treatment, it becomes difficult or impossible to detach the product, and there is a problem that product breakage rate increases and product yields are remarkably lowered.
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