prov:value
| - like the portion 2c.Likewise, the inserts of FIGS. 3, 4, and 5 are constituted by a metallic plate that is folded so as to be L-shaped or U-shaped, are respectively designated by the reference numerals 3, 4, and 5, and are also provided with a recess 3a, 4a, and 5a.Only the ends of the insert 4 are not folded.Said inserts are generally constituted by metals such as Mo, Pt, Ta, W, and the like; the
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