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A
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SECTION A — HUMAN NECESSITIES
B
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SECTION B — PERFORMING OPERATIONSTRANSPORTING
C
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SECTION C — CHEMISTRYMETALLURGY
D
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SECTION D — TEXTILESPAPER
E
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SECTION E — FIXED CONSTRUCTIONS
F
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SECTION F — MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
G
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SECTION G — PHYSICS
G01
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INSTRUMENTS
G01
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MEASURINGTESTING
G01B
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MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONSMEASURING ANGLESMEASURING AREASMEASURING IRREGULARITIES OF SURFACES OR CONTOURS
G01C
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MEASURING DISTANCES, LEVELS OR BEARINGSSURVEYINGNAVIGATIONGYROSCOPIC INSTRUMENTSPHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F;  radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effect, propagation time, of radio waves, analogous arrangements using other waves G01S)
G01D
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MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLEARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED BY A SINGLE OTHER SUBCLASSTARIFF METERING APPARATUSTRANSFERRING OR TRANSDUCING ARRANGEMENTS NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLEMEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
G01F
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MEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVELMETERING BY VOLUME [2, 5]
G01G
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WEIGHING
G01H
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MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES [4]
G01J
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MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHTCOLORIMETRYRADIATION PYROMETRY [2]
G01J 1/00
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Photometry, e.g. photographic exposure meter (spectrophotometry G01J 3/00; specially adapted for radiation pyrometry G01J 5/00)
G01J 3/00
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SpectrometrySpectrophotometryMonochromatorsMeasuring colours [4]
G01J 3/02
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Details
G01J 3/04
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. . Slit arrangements
G01J 3/06
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. . Scanning arrangements
G01J 3/08
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. . Beam-switching arrangements
G01J 3/10
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. . Arrangements of light sources specially adapted for spectrometry or colorimetry
G01J 3/12
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Generating the spectrumMonochromators
G01J 3/14
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. . using refracting elements, e.g. prism (G01J 3/18, G01J 3/26 take precedence)
G01J 3/16
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. . . with autocollimation
G01J 3/18
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. . using diffraction elements, e.g. grating
G01J 3/20
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. . . Rowland circle spectrometers
G01J 3/22
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. . . Littrow mirror spectrometers
G01J 3/24
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. . . using gratings profiled to favour a specific order
G01J 3/26
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. . using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filter
G01J 3/28
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Investigating the spectrum (using colour filters G01J 3/51) [4]
G01J 3/30
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. . Measuring the intensity of spectral lines directly on the spectrum itself (G01J 3/42, G01J 3/44 take precedence)
G01J 3/32
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. . . Investigating bands of a spectrum in sequence by a single detector
G01J 3/36
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. . . Investigating two or more bands of a spectrum by separate detectors
G01J 3/40
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. . Measuring the intensity of spectral lines by determining density of a photograph of the spectrumSpectrography (G01J 3/42, G01J 3/44 take precedence) [4]
G01J 3/42
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. . Absorption spectrometryDouble-beam spectrometryFlicker spectrometryReflection spectrometry (beam-switching arrangements G01J 3/08) [4]
G01J 3/427
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. . . Dual wavelength spectrometry [4]
G01J 3/433
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. . . Modulation spectrometryDerivative spectrometry [4]
G01J 3/44
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. . Raman spectrometryScattering spectrometry [4]
G01J 3/443
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. . Emission spectrometry [4]
G01J 3/447
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. . Polarisation spectrometry [4]
G01J 3/45
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. . Interferometric spectrometry [4]
G01J 3/453
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. . . by correlation of the amplitudes [4]
G01J 3/457
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. . Correlation spectrometry, e.g. of the intensity (G01J 3/453 takes precedence) [4]
G01J 3/46
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Measurement of colourColour measuring devices, e.g. colorimeters (measuring colour temperature G01J 5/60) [4]
G01J 3/50
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. . using electric radiation detectors [4]
G01J 3/51
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. . . using colour filters [4]
G01J 3/52
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. . using colour charts
G01J 4/00
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Measuring polarisation of light [2]
G01J 5/00
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Radiation pyrometry
G01J 7/00
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Measuring velocity of light
G01J 9/00
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Measuring optical phase differenceDetermining degree of coherenceMeasuring optical wavelength (spectrometry G01J 3/00) [3]
G01J 11/00
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Measuring the characteristics of individual optical pulses or of optical pulse trains [5]
G01K
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MEASURING TEMPERATUREMEASURING QUANTITY OF HEATTHERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J 5/00)
G01L
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MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G) [4]
G01M
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TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURESTESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
G01N
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INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing processes other than immunoassay, involving enzymes or micro-organisms C12M, C12Q)
G01P
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MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION OR SHOCKINDICATING PRESENCE OR ABSENCE OF MOVEMENT INDICATING DIRECTION OF MOVEMENT  (measuring angular rate using gyroscopic effects G01C 19/00; combined measuring devices for measuring two or more variables of movement G01C 23/00; measuring velocity of sound G01H 5/00; measuring velocity of light G01J 7/00; determining direction or velocity of solid objects by reflection or reradiation of radio or other waves and based on propagation effects, e.g. Doppler effect, propagation time or direction of propagation, G01S; measuring speed of nuclear radiation G01T)
G01Q
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SCANNING-PROBE TECHNIQUES OR APPARATUSAPPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING-PROBE MICROSCOPY [SPM] [2010.01]
G01R
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MEASURING ELECTRIC VARIABLESMEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J 3/12)
G01S
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RADIO DIRECTION-FINDINGRADIO NAVIGATIONDETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVESLOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVESANALOGOUS ARRANGEMENTS USING OTHER WAVES
G01T
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MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N 23/00; tubes for determining the presence, intensity, density or energy of radiation or particles  H01J 47/00)
G01V
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GEOPHYSICSGRAVITATIONAL MEASUREMENTSDETECTING MASSES OR OBJECTSTAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B 29/02) [4, 6]
G01W
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METEOROLOGY (radar, sonar, lidar or analogous systems, designed for meteorological use G01S 13/95, G01S 15/88, G01S 17/95)
G02
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OPTICS
G03
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PHOTOGRAPHYCINEMATOGRAPHYANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVESELECTROGRAPHYHOLOGRAPHY [4]
G04
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HOROLOGY
G05
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CONTROLLINGREGULATING
G06
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COMPUTINGCALCULATINGCOUNTING
G07
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CHECKING-DEVICES
G08
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SIGNALLING
G09
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EDUCATINGCRYPTOGRAPHYDISPLAYADVERTISINGSEALS
G10
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MUSICAL INSTRUMENTSACOUSTICS
G11
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INFORMATION STORAGE
G12
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INSTRUMENT DETAILS
G21
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NUCLEONICS
G21
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NUCLEAR PHYSICSNUCLEAR ENGINEERING
G99
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SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]
H
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SECTION H — ELECTRICITY

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