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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)
G01C 1/00
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Measuring angles
G01C 3/00
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Measuring distances in line of sightOptical rangefinders (tapes, chains, or wheels for measuring length G01B 3/00; active triangulation systems, i.e. using the transmission and reflection of electromagnetic waves other than radio waves, G01S 17/48) [1, 2006.01]
G01C 5/00
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Measuring heightMeasuring distances transverse to line of sightLevelling between separated pointsSurveyors' levels (G01C 3/20, G01C 3/30 take precedence)
G01C 7/00
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Tracing profiles (by photogrammetry or videogrammetry G01C 11/00)
G01C 9/00
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Measuring inclination, e.g. by clinometers, by levels
G01C 11/00
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Photogrammetry or videogrammetry, e.g. stereogrammetryPhotographic surveying [1, 2006.01]
G01C 13/00
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Surveying specially adapted to open water, e.g. sea, lake, river or canal (liquid level metering G01F)
G01C 15/00
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Surveying instruments or accessories not provided for in groups G01C 1/00-G01C 13/00
G01C 17/00
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CompassesDevices for ascertaining true or magnetic north for navigation or surveying purposes (using gyroscopic effect G01C 19/00)
G01C 19/00
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GyroscopesTurn-sensitive devices with vibrating massesTurn-sensitive devices without moving masses
G01C 19/02
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Rotary gyroscopes
G01C 19/04
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. . Details
G01C 19/06
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. . . Rotors
G01C 19/08
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. . . . electrically driven (G01C 19/14 takes precedence)
G01C 19/10
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. . . . . Power supply
G01C 19/12
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. . . . fluid driven (G01C 19/14 takes precedence)
G01C 19/14
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. . . . Fluid rotors
G01C 19/16
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. . . SuspensionsBearings
G01C 19/18
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. . . . providing movement of rotor with respect to its rotational axes (G01C 19/20, G01C 19/24 take precedence)
G01C 19/20
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. . . . in fluid
G01C 19/22
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. . . . torsional
G01C 19/24
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. . . . using magnetic or electrostatic fields
G01C 19/26
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. . . Caging, i.e. immobilising moving parts, e.g. for transport
G01C 19/28
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. . . Pick-offs, i.e. devices for taking off an indication of the displacement of the rotor axis
G01C 19/30
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. . . Erection devices, i.e. devices for restoring rotor axis to a desired position (for instrument indicating the vertical G01C 19/46)
G01C 19/32
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. . . Indicating or recording means specially adapted for rotary gyroscopes
G01C 19/34
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. . for indicating a direction in the horizontal plane, e.g. directional gyroscopes
G01C 19/36
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. . . with north-seeking action by magnetic means, e.g. gyromagnetic compasses
G01C 19/38
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. . . with north-seeking action by other than magnetic means, e.g. gyrocompasses using earth's rotation
G01C 19/40
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. . for control by signals from a master compass, i.e. repeater compasses
G01C 19/42
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. . for indicating rate of turnfor integrating rate of turn
G01C 19/44
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. . for indicating the vertical
G01C 19/46
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. . . Erection devices for restoring rotor axis to a desired position
G01C 19/48
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. . . . operating by electrical means (G01C 19/54 takes precedence)
G01C 19/50
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. . . . operating by mechanical means (G01C 19/54 takes precedence)
G01C 19/52
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. . . . operating by fluid means (G01C 19/54 takes precedence)
G01C 19/54
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. . . . with correction for acceleration forces due to movement of instrument
G01C 19/56
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Turn-sensitive devices with vibrating masses, e.g. tuning fork
G01C 19/58
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Turn-sensitive devices without moving masses [3]
G01C 19/60
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. . Electronic or nuclear magnetic resonance gyrometers [3, 4]
G01C 19/62
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. . . with optical pumping [3]
G01C 19/64
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. . Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams [3]
G01C 19/66
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. . . Ring laser gyrometers [5]
G01C 19/68
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. . . . Lock-in prevention [5]
G01C 19/70
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. . . . . by mechanical means [5]
G01C 19/72
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. . . with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers [5]
G01C 21/00
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NavigationNavigational instruments not provided for in groups G01C 1/00-G01C 19/00 (measuring distance traversed on the ground by a vehicle G01C 22/00; control of position, course, altitude or attitude of vehicles G05D 1/00; traffic control systems for road vehicles involving transmission of navigation instructions to the vehicle G08G 1/0968)
G01C 22/00
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Measuring distance traversed on the ground by vehicles, persons, animals or other moving solid bodies, e.g. using odometers or using pedometers
G01C 23/00
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Combined instruments indicating more than one navigational value, e.g. for aircraftCombined measuring devices for measuring two or more variables of movement, e.g. distance, speed, acceleration
G01C 25/00
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Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass (testing, calibrating, or compensating compasses G01C 17/38)
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 APPARATUSMEASURING OR TESTING NOT OTHERWISE PROVIDED FOR (means structurally associated with lightning or other overvoltage discharging apparatus for recording the operation thereof G01R; displaying information in general G09F; recording in a way which requires playback through a transducer G11B)
G01F
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MEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVELMETERING BY VOLUME (milk flow sensing devices in milking machines or devices A01J 5/01; measuring or recording blood flow A61B 5/02, A61B 8/06; metering media to the human body A61M 5/168; burettes or pipettes B01L 3/02; arrangements of liquid volume meters or volume-flow meters in liquid-delivering apparatus, e.g. for retail sale purposes, B67D 7/16; pumps, fluid motors, details common to measuring or metering devices and pumps or fluid motors F01-F04; locating, determining distance or velocity using reflection or reradiation of radio waves, analogous arrangements using other waves G01S; systems for ratio control G05D 11/00) [2, 5]
G01G
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WEIGHING (sorting by weighing B07C 5/16)
G01H
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MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES (generation of mechanical vibrations without measurement B06B, G10K; measuring position, direction or velocity of an object G01C, G01S; measuring quasi-steady pressure of a fluid G01L 7/00; determining unbalance G01M 1/14; determining properties of material by sonic or ultrasonic waves transmitted therethrough G01N; systems using the reflection or reradiation of acoustic waves, e.g. acoustic imaging, G01S 15/00; seismology, seismic prospecting, acoustic prospecting G01V 1/00; acousto-optical devices per seG02F; obtaining records by techniques analogous to photography using ultrasonic, sonic or infrasonic waves G03B 42/06; speech analysis or synthesis, speech recognition G10L; information storage based on relative movement between record carrier and transducer G11B; piezo-electric, electrostrictive or magnetostrictive elements in general H01L; manufacture of electromechanical resonators by processes which include measurement of frequency with consequential modification of the resonator H03H 3/00) [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 (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) [2]
G01K
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MEASURING TEMPERATUREMEASURING QUANTITY OF HEATTHERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (sensing temperature changes for compensating measurements of other variables or for compensating readings of instruments for variations in temperature, seeG01D or relevant subclass for variable measured; radiation pyrometry G01J; investigating or analysing materials by use of thermal means G01N 25/00; compound sensitive elements, e.g. bimetallic, G12B 1/02)
G01L
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MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (methods or devices for measuring specially adapted for metal-rolling mills B21B 38/00; sensing pressure changes for compensating measurements of other variables or for compensating readings of instruments for variations in pressure, see G01D or other relevant subclasses for the variable measured; weighing G01G;  converting a pattern of forces into electrical signals G06K 11/00) [4]
G01M
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TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURESTESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
G01N
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INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (separating components of materials in general B01D, B01J, B03, B07; apparatus fully provided for in a single other subclass, see the relevant subclass, e.g. B01L; measuring or testing processes other than immunoassay, involving enzymes or micro-organisms C12M, C12Q; investigation of foundation soil in situE02D 1/00; monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N 11/00; sensing humidity changes for compensating measurements of other variables or for compensating readings of instruments for variations in humidity, seeG01D or the relevant subclass for the variable measured; testing or determining the properties of structures G01M; measuring or investigating electric or magnetic properties of materials G01R; systems in general for determining distance, velocity or presence by use of propagation effects, e.g. Doppler effect, propagation time, of reflected or reradiated radio waves, analogous arrangements using other waves G01S; determining sensitivity, graininess, or density of photographic materials G03C 5/02; testing component parts of nuclear reactors G21C 17/00)
G01P
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MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCKINDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B 5/02, A61B 8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L 3/00; vehicle lighting systems adapted to indicate speed B60Q 1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C 23/00; measuring velocity of sound G01H; 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, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V)
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 (measuring physical variables of any kind by conversion into electric variables, see Note (4) following the title of class G01; measuring diffusion of ions in an electric field, e.g. electrophoresis, electro-osmosis, G01N; investigating non-electric or non-magnetic properties of materials by using electric or magnetic methods G01N; indicating correct tuning of resonant circuits H03J 3/12; monitoring electronic pulse counters H03K 21/40; monitoring operation of communication systems H04)
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; electric discharge tubes for analysing radiation or particles H01J 40/00, H01J 47/00, H01J 49/00)
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 (influencing weather conditions A01G 15/00; dispersing fog E01H 13/00; instruments for measuring single variables in general, see the appropriate subclasses of class G01, e.g. G01K, G01L; 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 (making optical elements or apparatus B24B, B29D 11/00, C03, or other appropriate subclasses or classes; materials per se, see the relevant places, e.g. C03B, C03C)
G03
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PHOTOGRAPHYCINEMATOGRAPHYANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVESELECTROGRAPHYHOLOGRAPHY (reproduction of pictures or patterns by scanning and converting into electrical signals H04N) [4]
G04
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HOROLOGY
G05
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CONTROLLINGREGULATING
G06
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COMPUTINGCALCULATINGCOUNTING (score computers for games A63B 71/06, A63D 15/20, A63F 1/18; combinations of writing implements with computing devices B43K 29/08)
G07
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CHECKING-DEVICES
G08
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SIGNALLING (indicating or display devices per seG09F; transmission of pictures H04N)
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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