| http://www.w3.org/ns/prov#value | - For this reason, problems arise such as the inability to lift up the vehicle body 4 with one end portion 1a of the traveling body 1 serving as a supporting point by swinging the boom 5 downwards to press the bucket 9 against the ground surface and the inability to obtain a sufficient force of excavation if a strong force of excavation is required.
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