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physics (99) 99
electricity (95) 95
performing operations (80) 80
transporting (80) 80
chemistry (76) 76
science & technology (75) 75
electric communication technique (59) 59
calculating (47) 47
computing (47) 47
counting (47) 47
metallurgy (45) 45
basic electric elements (39) 39
blasting (39) 39
heating (39) 39
lighting (39) 39
mechanical engineering (39) 39
telephonic communication (39) 39
weapons (39) 39
casings or constructional details of electric apparatus (38) 38
electric techniques not otherwise provided for (38) 38
manufacture of assemblages of electrical components (38) 38
printed circuits (38) 38
human necessities (37) 37
physical sciences (37) 37
technology (35) 35
testing (26) 26
measuring (25) 25
materials science (24) 24
beer (23) 23
biochemistry (23) 23
electric digital data processing (23) 23
enzymology (23) 23
general tagging of cross-sectional technologies spanning over several sections of the ipc (23) 23
general tagging of new technological developments (23) 23
microbiology (23) 23
mutation or genetic engineering (23) 23
spirits (23) 23
technical subjects covered by former uspc cross-reference art collections [xracs] and digests (23) 23
vinegar (23) 23
wine (23) 23
processes using microorganisms (22) 22
technical subjects covered by former uspc (21) 21
fixed constructions (20) 20
chemistry, multidisciplinary (19) 19
fermentation or enzyme-using processes to synthesise a desiredchemical compound or composition or to separate optical isomersfrom a racemic mixture (19) 19
life sciences & biomedicine (19) 19
processes or means, e.g. batteries, for the direct conversionof chemical into electrical energy (18) 18
materials science, multidisciplinary (17) 17
technical subjects covered by former us classification (17) 17
engineering (15) 15
keys (15) 15
locks (15) 15
safes (15) 15
science & technology - other topics (15) 15
window or door fittings (15) 15
engineering elements and units (14) 14
general measures for producing and maintaining effectivefunctioning of machines or installations (14) 14
thermal insulation in general (14) 14
vehicles in general (14) 14
aircraft (12) 12
aviation (12) 12
cosmonautics (12) 12
handling record carriers (12) 12
hygiene (12) 12
medical or veterinary science (12) 12
nanoscience & nanotechnology (12) 12
presentation of data (12) 12
recognition of data (12) 12
record carriers (12) 12
trapping (12) 12
agriculture (11) 11
animal husbandry (11) 11
bearings (11) 11
controlling (11) 11
elements or crankshaft mechanisms (11) 11
fishing (11) 11
flexible shafts (11) 11
forestry (11) 11
general devices for heat treatment of ferrous or non-ferrousmetals or alloys (11) 11
hinges or other suspension devices for doors, windows or wings (11) 11
hunting (11) 11
image data processing or generation, in general (11) 11
making metal malleable by decarburisation, tempering or othertreatments (11) 11
metallurgy of iron (11) 11
modifying the physical structure of ferrous metals (11) 11
physical or chemical processes or apparatus in general (11) 11
regulating (11) 11
rotary bodies other than gearing elements (11) 11
shafts (11) 11
transmission (11) 11
transmission of digital information, e.g. telegraphiccommunication (11) 11
chemistry, physical (10) 10
data processing systems or methods, specially adapted foradministrative, commercial, financial, managerial, supervisoryor forecasting purposes (10) 10
engineering, electrical & electronic (10) 10
photovoltaic cells (10) 10
physics, applied (10) 10
systems for controlling or regulating non-electric variables (10) 10
systems or methods specially adapted for administrative,commercial, financial, managerial, supervisory or forecastingpurposes, not otherwise provided for (10) 10
furnaces (9) 9
indexing scheme relating to hinges or other suspension devicesfor doors, windows or wings and devices for moving wings intoopen or closed position, checks for wings and wing fittings nototherwise provided for, concerned with the functioning of thewing (9) 9
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