| 摘要 |
PROBLEM TO BE SOLVED: To easily manufacture even a large cross section; to improve accuracy of a corner part; and to improve strength more than a triangular cross section while maintaining the merits such as excellence of front visibility and weight reduction. SOLUTION: This arm of a cylindrical structure constitutes a working machine of a construction machine, and a cross-sectional shape is formed in a substantially trapezoidal shape having an apex part of a circular arc shape. COPYRIGHT: (C)2004,JPO&NCIPI
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