| 摘要 |
Improvements to the construction of slatted-shutter frames for housing and retaining, in a displaceable manner, segments in bull's-eyes for the game of darts, characterized in that the head in the form of an arrow with double slope (on the edge) is replaced by a catch with a single slope, and on the point opposite that which the lower end of the second, eliminated slope would have to occupy there is a small longitudinal projecting edge, and said catch-shaped heads are located only straddling the edges of the radii and therefore not on the edge of the circles in order thereby to determine that each side of the four sides of the front part of the cavity which form a housing for each segment has the arrangement of hooks alternating with the absence of a hook. <IMAGE>
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