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chemistry (13) 13
metallurgy (13) 13
chemical materials for use in breathing apparatus (5) 5
chemical means for extinguishing fires or for combating orprotecting against harmful chemical agents (5) 5
fire-fighting (5) 5
human necessities (5) 5
inorganic chemistry (5) 5
life-saving (5) 5
compounds thereof (4) 4
non-metallic elements (4) 4
performing operations (3) 3
transporting (3) 3
adhesives (2) 2
alloys (2) 2
artificial stone (2) 2
blasting (2) 2
cements (2) 2
ceramics (2) 2
compositions thereof, e.g. mortars, concrete or like buildingmaterials (2) 2
compounds of the metals beryllium, magnesium, aluminium,calcium, strontium, barium, radium, thorium, or of therare-earth metals (2) 2
concrete (2) 2
crushing, pulverising, or disintegrating (2) 2
crushing, pulverising, or disintegrating in general (2) 2
drying (2) 2
drying solid materials or objects by removing liquid therefrom (2) 2
dyes (2) 2
ferrous or non-ferrous alloys (2) 2
heating (2) 2
impregnating or coating of paper (2) 2
lighting (2) 2
lime, magnesia (2) 2
mechanical engineering (2) 2
milling grain (2) 2
miscellaneous applications of materials (2) 2
miscellaneous compositions (2) 2
natural resins (2) 2
paints (2) 2
paper (2) 2
paper not otherwise provided for (2) 2
paper-making (2) 2
polishes (2) 2
preparation thereof not covered by subclasses d21c or d21d (2) 2
preparatory treatment of grain for milling (2) 2
production of cellulose (2) 2
pulp compositions (2) 2
refractories (2) 2
slag (2) 2
textiles (2) 2
treatment of alloys or non-ferrous metals (2) 2
treatment of finished paper not covered by class b31 or subclass d21g (2) 2
treatment of natural stone (2) 2
weapons (2) 2
apparatus therefor (1) 1
cladding or plating by soldering or welding (1) 1
controlling (1) 1
cutting by applying heat locally, e.g. flame cutting (1) 1
earth drilling (1) 1
fertilisers (1) 1
fixed constructions (1) 1
general methods of organic chemistry (1) 1
machine tools (1) 1
manufacture thereof (1) 1
materials for miscellaneous applications, not provided forelsewhere (1) 1
metal-working not otherwise provided for (1) 1
mining (1) 1
organic chemistry (1) 1
phosphatic fertilisers (1) 1
physics (1) 1
preparation of carbon black (1) 1
regulating (1) 1
safety devices, transport, filling-up, rescue, ventilation, ordraining in or of mines or tunnels (1) 1
soldering or unsoldering (1) 1
systems for controlling or regulating non-electric variables (1) 1
treatment of inorganic materials, other than fibrous fillers,to enhance their pigmenting or filling properties (1) 1
welding (1) 1
working by laser beam (1) 1
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