construction site with a telescopic crane.

construction site telescopic crane machine hoist rope wire ropes chains sheaves lift materials move horizontally lifting heavy objects transporting places device mechanical advantage normal capability human transportation freight movement materials equipment tubes fitted inside hydraulic cylinder powered mechanism extends retracts increase decrease length types booms projects compactness adaptable mobile applications truck-mounted tower superstructure top functions crane jib trees park blue sky counterbalance counterweight concrete hedge green houses wooden fence