articulated arm bucket build cab dig digger engine engineering vehicle excavator heavy hole icon machine minning pictogram sign symbol track vehicle work aerial-work-platform articulating-boom-lift basket-crane boom-lift cage cherry-picker cherrypicker compact danger dangerous elevated elevated-work-platform extension height high hydraladder hydraulic-arm hydraulic-lifting-system hydraulic-platform hydraulics lift looking-up maintenance man-lift manoeuvrable mobile-hydraulic-platform nifty-lifter platform railing rails raised raised-platform safety tall trees up-high workplatform