abstraction

alternative

and

brown

cargo

coal

coking

color

contemporary

day

diggers

energy

excavator

flammable

fossil

fuel

generation

grajfer

gripper

hand

heap

heating

hydraulic

industry

lighting

lignite

loading

lumberyard

machinery

manipulator

material

mechanical

mine

mining

motion

natural

nugget

ore

people

pile

pollutant

power

propellant

rock

sedimentary

separation

slow

source

steel

storage

surface

thermal

tools

transportation

truck

working