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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
G01D 1/00
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Measuring arrangements giving results other than momentary value of variable, of general application (G01D 3/00 takes precedence; in tariff metering apparatus G01D 4/00; transducers not specially adapted for a specific variable G01D 5/00)
G01D 3/00
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Measuring arrangements with provision for the special purposes referred to in the subgroups of this group
G01D 4/00
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Tariff metering apparatus (in taximeters G07B 13/00; apparatus actuated by coins, cards or the like with meter-controlled dispensing of liquid, gas, or electricity G07F 15/00)
G01D 5/00
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Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable (G01D 3/00 takes precedence; specially adapted for apparatus giving results other than momentary value of variable G01D 1/00) [6]
G01D 5/02
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using mechanical means
G01D 5/04
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. . using leversusing camsusing gearing
G01D 5/06
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. . acting through a wall or enclosure, e.g. by bellows, by magnetic coupling
G01D 5/08
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. . Reducing the effects of friction, e.g. by applying vibrations
G01D 5/10
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. . Applying external forces to increase force available for operation of indicating or recording part
G01D 5/12
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using electric or magnetic means (G01D 5/06 takes precedence) [3]
G01D 5/14
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. . influencing the magnitude of a current or voltage
G01D 5/16
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. . . by varying resistance
G01D 5/165
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. . . . by relative movement of a point of contact and a resistive track [6]
G01D 5/18
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. . . by varying effective impedance of discharge tubes or semiconductor devices
G01D 5/20
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. . . by varying inductance, e.g. by a movable armature
G01D 5/22
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. . . . differentially influencing two coils
G01D 5/24
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. . . by varying capacitance
G01D 5/241
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. . . . by relative movement of capacitor electrodes [6]
G01D 5/242
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. . . by varying output of an electrodynamic device, e.g. of a tachodynamo
G01D 5/243
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. . influencing the phase or frequency of ac
G01D 5/244
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. . influencing characteristics of pulses or pulse trainsgenerating pulses or pulse trains [6]
G01D 5/245
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. . . using a variable number of pulses in a train
G01D 5/246
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. . . by varying the duration of individual pulses
G01D 5/247
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. . . using time shifts of pulses
G01D 5/248
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. . . by varying pulse repetition frequency
G01D 5/249
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. . . using pulse code
G01D 5/25
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. . Selecting one or more conductors or channels from a plurality of conductors or channels, e.g. by closing contacts
G01D 5/251
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. . . one conductor or channel
G01D 5/252
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. . . a combination of conductors or channels
G01D 5/26
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using optical means, i.e. using infra-red, visible or ultra-violet light
G01D 5/28
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. . with deflection of beams of light, e.g. for direct optical indication (G01D 5/40 takes precedence)
G01D 5/30
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. . . the beams of light being detected by photocells
G01D 5/32
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. . with attenuation or whole or partial obturation of beams of light (G01D 5/40 takes precedence)
G01D 5/34
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. . . the beams of light being detected by photocells
G01D 5/347
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. . . . using displacement encoding scales [6]
G01D 5/353
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. . . . influencing the transmission properties of an optical fibre [6]
G01D 5/36
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. . . . Forming the light into pulses
G01D 5/38
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. . . . . by diffraction gratings
G01D 5/39
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. . Scanning a visible indication of the measured value and reproducing this indication at a remote place, e.g. on the screen of a cathode-ray tube
G01D 5/40
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. . specially adapted for use with infra-red light
G01D 5/42
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using fluid means
G01D 5/44
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. . using jets of fluid
G01D 5/46
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. . . by deflecting or throttling the flow
G01D 5/48
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using wave or particle radiation means (G01D 5/26 takes precedence)
G01D 5/50
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. . derived from a radioactive source
G01D 5/52
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. . . detected by a counter tube
G01D 5/54
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using means specified in two or more of groups G01D 5/02, G01D 5/12, G01D 5/26, G01D 5/42, and G01D 5/48
G01D 5/56
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. . using electric or magnetic means
G01D 5/58
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. . using optical means, i.e. using infra-red, visible or ultra-violet light
G01D 5/60
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. . using fluid means
G01D 5/62
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. . using wave or particle radiation means not covered by group G01D 5/58
G01D 7/00
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Indicating measured values
G01D 9/00
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Recording measured values
G01D 11/00
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Component parts of measuring arrangements not specially adapted for a specific variable (G01D 13/00, G01D 15/00 take precedence)
G01D 13/00
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Component parts of indicators for measuring arrangements not specially adapted for a specific variable
G01D 15/00
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Component parts of recorders for measuring arrangements not specially adapted for a specific variable
G01D 18/00
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Testing or calibrating apparatus or arrangements provided for in groups G01D 1/00-G01D 15/00
G01D 21/00
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Measuring 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)
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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