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Hierarchical view
A - occupational safety and health
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B - physics, chemistry and natural phenomena
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C - inorganic chemicals
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D - organic compounds
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E - enzymes
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F - natural products and substances
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G - industrial products
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H - equipment, workplaces and operations
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Ha - premises and workplaces
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Hb - workplaces
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Hc - seats and working surfaces
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Hd - radiation equipment and processes
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He - electrical equipment
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Hf - prime movers
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Hg - power transmission
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Hh - pressure vessels and systems
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Hi - refrigerating equipment
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Hj - heating equipment
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Hk - industrial furnaces
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Hl - tools and work holding devices
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Hm - machinery
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Hn - roll machines
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Ho - forming
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Hp - machining
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Hpa - machining with reciprocating tools
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Hpaf - planing machines (metal)
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Hpal - shaping machines
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Hpap - broaching machines
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Hpe - machining with rotating tool or work
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Hpel - lathes (metalworking)
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Hpela - boring and turning mills
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Hpeli - threading machines
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Hpely - chucks
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Hpep - drilling machines
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Hpes - boring machines
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Hpev - milling machines
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Hpex - machining centres
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Hpey - transfer machines
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Hpf - cutting speed
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Hph - chip removal
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Hphb - chip breakers
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Hpi - erosion machining
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Hpia - spark machining
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Hpie - electrolytic machining
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Hpiep - electropolishing
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Hpik - electron beam machining
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Hpil - laser beam machining
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Hpim - chemical milling
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Hpiu - ultrasonic machining
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Hpo - woodworking machines
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Hpob - unbarking machines
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Hpod - planing machines (wood)
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Hpoda - surface planers
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Hpode - thicknessers
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Hpodi - matchers
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Hpodo - moulders
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Hpody - cutter blocks
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Hpof - tenoning machines
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Hpok - mortisers
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Hpol - lathes (woodworking)
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Hpom - spindle moulders
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Hpon - routers
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Hpoo - trimmers
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Hpos - wood-splitting machines
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Hpox - combination woodworking machines
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Hpu - saws
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Hpum - metalcutting saws
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Hpuma - hacksawing machines
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Hpumi - friction saws
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Hpuw - woodworking saws
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Hpuwa - frame saws
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Hpuwe - band saws
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Hpuwi - scroll saws
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Hpuwo - circular saws
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Hpuwob - tilting-arbor saws
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Hpuwom - travelling cross-cut saws
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Hpuwox - riving knife
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Hpux - saws for plastics
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Hpy - abrasive operations
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Hpyb - manual abrasive operations
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Hpybo - glass cutting
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Hpybu - diamond cutting
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Hpym - grinding machines
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Hpyma - abrasive-wheel cutting-off machines
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Hpymc - centreless grinding machines
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Hpyme - swing-frame grinding machines
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Hpyp - polishing machines
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Hpyr - pulpwood grinders
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Hpys - sanding machines
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Hpysq - buffing machines (leather)
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Hpyss - sanding machines (wood)
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Hpysu - concrete grinders
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Hpyt - tool grinders
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Hpyta - grinding angle
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Hpyx - abrasive wheels
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Hpyxa - truing of grinding wheels
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Hr - shearing and cutting
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Hs - heat treatment
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Ht - comminution
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Hu - separating, sorting
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Hv - cleaning
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Hw - welding and cutting
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Hx - joining and fastening
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Hy - surface coating
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Hz - packing, filling
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I - equipment, workplaces and operations (2)
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J - equipment, workplaces and operations (3)
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K - work and industrial organization
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L - fire, explosions
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M - occupational pathology
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N - occupational pathology (cont.)
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P - physiology, anatomy, psychology
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Q - measurement and investigation
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R - medical prevention and treatment
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S - safety and health engineering
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T - personal protective equipment
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V - safety and health organization
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W - groups of persons
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X - industries
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Y - occupational accidents
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Z - generalities
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1 - Africa
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2 - America
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3 - Asia
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4 - Europe
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5 - Oceania
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6 - geographical areas
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7 - international governmental organizations (non UN)
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8 - UN organizations
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9 - international non-governmental organizations
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