| 摘要 |
first to fourth cylindrical members formed as a unitary body with a weighing machine, between an upper case and a lower case, centering around a first center portion of a circle on the upper case; first to fourth holes formed centering around a second center portion of a circle on the lower case; an assembling member inserted into each of the first to fourth holes and the first to fourth cylindrical members; and a twist base plate on which a semicircular groove is formed to rotate the assembling member.
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