| 摘要 |
PROBLEM TO BE SOLVED: To provide a genuine natural shell spoon capable of radiating the reflectance of a highly directive shell widely.SOLUTION: In a natural shell spoon of a curved plate shape recessed on the side of a rear face 3, the marginal part 5 of the side of the surface 4 of the spoon is formed into a flat slope face inclined toward the rear face, at an angle α of 5 to 45 degrees with respect to the adjoining surface 4. |
