| http://www.w3.org/ns/prov#value | - These flaps are of a flexible material, such as leather, rubber or plastic and are preferably of semicircular contour; and they are of such size relative to the transverse width of channel 12, that the summit points of the semicircular arcs formed by their edges are spaced from each other by a distance somewhat larger than the length of a putting blade (FIGS. 2 and 3).
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