| http://www.w3.org/ns/prov#value | - In this embodiment, especially in the case of forming the alloy layer 20 on the both side surfaces of the ring groove 3, the laser light 8 is applied with an incidence angle ?? as shown in FIG. 2 while an edge part 12 is masked by a masking plate 9 coated with black lead similar to the laser absorbent 10 with which the powder alloy layer on the groove is coated.
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