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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]
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)
G01R 1/00
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Details of instruments or arrangements of the types covered by groups G01R 5/00-G01R 13/00 or G01R 31/00 (constructional details particular to electromechanical arrangements for measuring the electric consumption G01R 11/02) [3, 2006.01]
G01R 3/00
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Apparatus or processes specially adapted for the manufacture of measuring instruments
G01R 5/00
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Instruments for converting a single current or a single voltage into a mechanical displacement
G01R 7/00
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Instruments capable of converting two or more currents or voltages into a single mechanical displacement (G01R 9/00 takes precedence)
G01R 9/00
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Instruments employing mechanical resonance
G01R 11/00
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Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption (monitoring electric consumption of electrically-propelled vehicles B60L 3/00)
G01R 11/02
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Constructional details
G01R 11/04
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. . HousingsSupporting racksArrangements of terminals
G01R 11/06
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. . Magnetic circuits of induction meters [2]
G01R 11/067
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. . . Coils therefor [2]
G01R 11/073
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. . . Armatures therefor [2]
G01R 11/09
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. . . . Disc armatures [2]
G01R 11/10
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. . Braking magnetsDamping arrangements
G01R 11/12
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. . Arrangements of bearings
G01R 11/14
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. . . with magnetic relief
G01R 11/16
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. . Adaptations of counters to electricity meters
G01R 11/17
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. . Compensating for errorsAdjusting or regulating means therefor [2]
G01R 11/18
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. . . Compensating for variations in ambient conditions [2]
G01R 11/185
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. . . . Temperature compensation [2]
G01R 11/19
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. . . Compensating for errors caused by disturbing torque, e.g. rotating-field errors of polyphase meters [2]
G01R 11/20
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. . . Compensating for phase errors in induction meters [2]
G01R 11/21
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. . . Compensating for errors caused by damping effects of the current, e.g. adjustment in the overload range [2]
G01R 11/22
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. . . Adjusting torque, e.g. adjusting starting torque, adjusting of polyphase meters for obtaining equal torques [2]
G01R 11/23
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. . . Compensating for errors caused by friction, e.g. adjustment in the light-load range [2]
G01R 11/24
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. . Arrangements for avoiding or indicating fraudulent use [4]
G01R 11/25
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. . Arrangements for indicating or signalling faults [2, 4]
G01R 11/30
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Dynamo-electric motor meters
G01R 11/32
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. . Watt-hour meters
G01R 11/34
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. . Ampère-hour meters
G01R 11/36
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Induction meters, e.g. Ferraris meters
G01R 11/38
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. . for single-phase operation
G01R 11/40
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. . for polyphase operation
G01R 11/42
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. . . Circuitry therefor
G01R 11/46
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Electrically-operated clockwork metersOscillatory metersPendulum meters
G01R 11/48
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Meters specially adapted for measuring real or reactive componentsMeters specially adapted for measuring apparent energy
G01R 11/50
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. . for measuring real component
G01R 11/52
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. . for measuring reactive component
G01R 11/54
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. . for measuring simultaneously at least two of the following three variables: real component, reactive component, apparent energy
G01R 11/56
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Special tariff meters
G01R 11/57
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. . Multi-rate meters (G01R 11/63 takes precedence) [2]
G01R 11/58
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. . . Tariff-switching devices therefor [2]
G01R 11/60
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. . Subtraction metersMeters measuring maximum or minimum-load hours
G01R 11/63
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. . Over-consumption meters, e.g. measuring consumption while a predetermined level of power is exceeded [2]
G01R 11/64
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. . Maximum meters, e.g. tariff for a period is based on maximum demand within that period
G01R 11/66
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. . . Circuitry
G01R 13/00
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Arrangements for displaying electric variables or waveforms [4]
G01R 15/00
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Details of measuring arrangements of the types provided for in groups G01R 17/00-G01R 29/00, G01R 33/00-G01R 33/26 or G01R 35/00 [1, 2006.01]
G01R 17/00
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Measuring arrangements involving comparison with a reference value, e.g. bridge
G01R 19/00
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Arrangements for measuring currents or voltages or for indicating presence or sign thereof (G01R 5/00 takes precedence; for measuring bioelectric currents or voltages A61B 5/04) [4]
G01R 21/00
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Arrangements for measuring electric power or power factor (G01R 7/12 takes precedence) [4]
G01R 22/00
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Arrangements for measuring time integral of electric power or current, e.g. electricity meters [4, 2006.01]
G01R 23/00
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Arrangements for measuring frequenciesArrangements for analysing frequency spectra
G01R 25/00
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Arrangements for measuring phase angle between a voltage and a current or between voltages or currents [2]
G01R 27/00
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Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
G01R 29/00
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Arrangements for measuring or indicating electric quantities not covered by groups G01R 19/00-G01R 27/00
G01R 31/00
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Arrangements for testing electric propertiesArrangements for locating electric faultsArrangements for electrical testing characterised by what is being tested not provided for elsewhere (testing or measuring semiconductors or solid state devices during manufacture H01L 21/66; testing line transmission systems H04B 3/46)
G01R 33/00
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Arrangements or instruments for measuring magnetic variables
G01R 35/00
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Testing or calibrating of apparatus covered by the other groups of this subclass [2]
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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