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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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Hha - pressure vessels
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Hhab - riveted pressure vessels
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Hhac - welded pressure vessels
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Hhad - unfired pressure vessels
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Hhada - gas cylinders
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Hhade - gas storage tanks
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Hhadi - acetylene generators
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Hhado - hydraulic accumulators
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Hhadu - air pressure vessels
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Hhady - aerosol containers
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Hhaf - fired pressure vessels
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Hhafa - steam boilers
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Hhafab - low-pressure steam boilers
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Hhafah - high-pressure steam boilers
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Hhafas - headers
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Hhafe - steam vessels
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Hhafi - boilers for heat transfer media
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Hhafk - glue boilers
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Hhafl - digesters
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Hhafm - melting kettles
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Hhafo - water heaters
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Hhafp - autoclaves
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Hhafpa - vulcanizers
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Hhafu - vaporizers
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Hhak - refrigerated pressure vessels
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Hham - pressure-vessel ends
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Hhap - pressure-vessel doors
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Hhav - vacuum chambers
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Hhax - pressure-jet equipment
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Hhaxw - water-jet processing machinery
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Hhe - pumps and compressors
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Hheb - pumps
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Hhebi - jet pumps
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Hhebir - air ejectors
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Hhebiw - water jet pumps
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Hhed - hydraulic pressure systems
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Hhef - compressors
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Hhefo - blow off guns
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Hhel - fans
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Hhela - ducts
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Hhele - duct branches
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Hheli - dampers
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Hhelo - ventilation doors
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Hhelu - wind tunnels
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Hhep - pressurized gas systems
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Hhi - pipes and fittings
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Hhip - piping
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Hhiph - high-pressure piping
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Hhir - flexible tubing
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Hhis - gaskets
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Hhit - water seals
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Hhiv - valves
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Hhiva - pressure reducing valves
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Hhive - pressure regulating valves
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Hhix - pipe connections
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Hhiz - installation of pipe systems
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Hho - nozzles
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Hhop - high-pressure spray nozzles
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Hhp - viewing ports
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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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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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