background blue cage cherry cherrypicker construction hoist hydraulic industrial lift maintenance picker sky vehicle work aerial-work-platform articulating-boom-lift basket-crane boom-lift cherry-picker compact danger dangerous elevated elevated-work-platform extension height high hydraladder hydraulic-arm hydraulic-lifting-system hydraulic-platform hydraulics looking-up man-lift manoeuvrable mobile-hydraulic-platform nifty-lifter platform railing rails raised raised-platform safety tall trees up-high workplatform angles arm basket cleaning electricity elevation equipment external Harness heights insulators machinery on-high perspectives power power-lines power-pole risks risky safety-harness surface surfaces washing workman