Construction Excavation: Backhoe excavator, loader, trenchers
Construction backhoe excavators and trenching equipment/machines excavate and load earth
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Trench construction/safety: Worker in bottom of trench gives hand signals to operator of backhoe/excavator to guide boom of backhoe into position to pull trench box to next position to the left. Note worker remains within trench box safety, and trench box is accessed by ladder at far end.
trenchconstructionsafetyworkerbottomhand signalsutilitybackhoeexcavatortrench shieldtrench boxladdertucsonarizonanovember 2006.mounted
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