| 摘要 |
PROBLEM TO BE SOLVED: To provide a boom of a working vehicle, which enables an increase in durability by reducing tensile stress applied to a lower wall of the boom, or which enables cost reduction, weight reduction, etc., by enabling the increase of the durability. SOLUTION: The boom 1 is assembled so that the second member 10 built into the boom 1 can bring about application of compressive stress to the first member 3 serving as an exterior wall of the boom 1.
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