| http://www.w3.org/ns/prov#value | - E and F faces in the forms of triangles are formed at the N end of the vibration block 1 as shown in FIG. 3C. In the same manner, G and H faces in the forms of triangles are formed at the S end of the vibration block 1 as shown in FIG. 3D. All of these faces E through H are formed as congruent isosceles triangles.
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