Abstract
This patent application has not been assigned to a company or institution.The following quote was obtained by the news editors from the background informa tion supplied bythe inventors: “Along with recent social conditions, an environ ment for manufacturing is greatly changed.For example, due to an increase in ov erseas production, an increase in the number of procured productsfrom overseas, and a decrease in the number of skilled engineers, it is difficult to maintain manufacturingskills, and quality control is exposed to a more severe situation.
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