Agricultural and forestry machinery. Safety requirements and testing for portable, hand-held, powered brush-cutters and grass-trimmers. Machines for use with back-pack power unit|Biological hazards, Cut-out devices, Radiation hazards, Noise (environmental), Ergonomics, Verification, Machine guards, Agricultural equipment, Components, Mechanically-operated devices, Grass trimmers, Handles (tools), Back (anatomy), Electrical safety, Forestry equipment, Cutting tools, Bushes, Dangerous materials, Fire safety, Dimensions, Approval testing, Hand tools, Equipment safety, Portable machine tools, Accident prevention, Control devices, Impact testing, Design, Handbooks, Brush cutters, Internal combustion engines, Hazards, Vibration measurement, Instructions for use, Poles, Gramineae, Protective barriers, Strength of materials, Machine tools, Marking, Vibration hazards, Sawing machines, Safety measures