at work ear earmuff protection blade bricks cutting danger ear-protection machine Noisy workman chain-saw cover covered covering dangers ear-muffs equipment feeding grinder helmeted helmets high-pressure improvement machinery maintenance men-at-work outdoor-power-equipment power-equipment protective-clothing protective-gear pushing risks risky safety safety-colours spray stumpgrinder sunlight sunshine tools tree tree-branches tree-loppers tree-lopping wood-chipper wood-chipping wood-chipping-machine work work-clothes workers workmen branches chipper chipping chipping-machine chips brick-cutter circular circular-saw dampen Dirt dirty dust electrical noise pavers paving power powerful protected protective safety-equipment safety-gear water wet working