chain saw cherry picker danger ear muffs extension Harness height looking down lopping men men at work noise reduction Noisy pruning raised platform safety safety harness tall tall tree tree up high workmen helmet tree loppers tree lopping work professional chain-saw cover covered covering dangers ear-muffs ear-protection equipment feeding grinder helmeted helmets high-pressure improvement machine machinery maintenance men-at-work outdoor-power-equipment power-equipment protection protective-clothing protective-gear pushing risks risky safety-colours spray stumpgrinder sunlight sunshine tools tree-branches tree-loppers tree-lopping wood-chipper wood-chipping wood-chipping-machine work-clothes workers workman branches chipper chipping chipping-machine chips