1920 page dragline,museum

boom bucket cablewire cast chain coal construction crane development dig digger dirt dragline dredge dredger drilling earth ecology energy engine engineering engineers environment equipment excavate excavating excavation excavator extreme geology grader ground heavy high history huge hydraulic industrial industry large limestone loader lorry machine machinery mechanics mine mineral mining mover museum operate operator ore outdoors pit power quarry remove resource retro rock rope scaffolding scoop shovel site sky soil stone structure surface technology tooth track transportation window work