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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
G02
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OPTICS
G02B
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OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS (G02F takes precedence; optical elements specially adapted for use in lighting devices or systems thereof F21V 1/00-F21V 13/00; measuring-instruments, see the relevant subclass of class G01, e.g. optical rangefinders G01C; testing of optical elements, systems, or apparatus G01M 11/00; spectacles G02C; apparatus or arrangements for taking photographs or for projecting or viewing them G03B; sound lenses G10K 11/30; electron and ion "optics" H01J; X-ray "optics" H01J, H05G 1/00; optical elements structurally combined with electric discharge tubes H01J 5/16, H01J 29/89, H01J 37/22; microwave "optics" H01Q; combination of optical elements with television receivers H04N 5/72; optical systems or arrangements in colour television systems H04N 9/00; heating arrangements specially adapted for transparent or reflecting areas H05B 3/84) [1, 7]
G02C
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SPECTACLESSUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLESCONTACT LENSES
G02F
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DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATINGTECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOFFREQUENCY-CHANGINGNON-LINEAR OPTICSOPTICAL LOGIC ELEMENTSOPTICAL ANALOGUE/DIGITAL CONVERTERS [2, 4]
G02F 1/00
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Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics [2, 4]
G02F 1/01
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for the control of the intensity, phase, polarisation or colour (G02F 1/29, G02F 1/35 take precedence) [2, 7]
G02F 1/015
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. . based on semiconductor elements with at least one potential jump barrier, e.g. PN, PIN junction (G02F 1/03 takes precedence) [3]
G02F 1/017
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. . . Structures with periodic or quasi periodic potential variation, e.g. superlattices, quantum wells [7]
G02F 1/025
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. . . in an optical waveguide structure (G02F 1/017 takes precedence) [5, 7]
G02F 1/03
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. . based on ceramics or electro-optical crystals, e.g. exhibiting Pockels or Kerr effect (G02F 1/061 takes precedence) [2, 4, 7]
G02F 1/035
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. . . in an optical waveguide structure [5]
G02F 1/05
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. . . with ferro-electric properties (G02F 1/035, G02F 1/055 take precedence) [2, 5]
G02F 1/055
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. . . the active material being a ceramic (G02F 1/035 takes precedence) [4, 5]
G02F 1/061
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. . based on electro-optical organic material (G02F 1/07 takes precedence) [7]
G02F 1/065
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. . . in an optical waveguide structure [7]
G02F 1/07
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. . based on electro-optical liquids exhibiting Kerr effect [2]
G02F 1/09
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. . based on magneto-optical elements, e.g. exhibiting Faraday effect [2]
G02F 1/095
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. . . in an optical waveguide structure [5]
G02F 1/11
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. . based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves (acousto-optical deflection G02F 1/33) [2]
G02F 1/125
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. . . in an optical waveguide structure [5]
G02F 1/13
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. . based on liquid crystals, e.g. single liquid crystal display cells [2]
G02F 1/133
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. . . Constructional arrangementsOperation of liquid crystal cellsCircuit arrangements (arrangements or circuits for control of liquid crystal elements in a matrix, not structurally associated with these elements G09G 3/36) [3, 7]
G02F 1/1333
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. . . . Constructional arrangements (G02F 1/135, G02F 1/136 take precedence) [5]
G02F 1/1334
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. . . . . based on polymer-dispersed liquid crystals, e.g. microencapsulated liquid crystals [7]
G02F 1/1335
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. . . . . Structural association of optical devices, e.g. polarisers, reflectors, with the cell [5]
G02F 1/13357
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. . . . . . Illuminating devices [7]
G02F 1/13363
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. . . . . . Birefringent elements, e.g. for optical compensation [7]
G02F 1/1337
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. . . . . Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers [5]
G02F 1/1339
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. . . . . GasketsSpacersSealing of the cell [5]
G02F 1/1341
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. . . . . Filling or closing of the cell [5]
G02F 1/1343
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. . . . . Electrodes [5]
G02F 1/1345
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. . . . . Conductors connecting electrodes to cell terminals [5]
G02F 1/1347
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. . . . . Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells [5]
G02F 1/135
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. . . . Liquid crystal cells structurally associated with a photoconducting or a ferro-electric layer, the properties of which can be optically or electrically varied [3]
G02F 1/136
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. . . . Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit (G02F 1/135 takes precedence) [5]
G02F 1/1362
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. . . . . Active matrix addressed cells [7]
G02F 1/1365
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. . . . . . in which the switching element is a two-electrode device [7]
G02F 1/1368
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. . . . . . in which the switching element is a three-electrode device [7]
G02F 1/137
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. . . characterised by a particular electro- or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction, dynamic scattering [3]
G02F 1/139
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. . . . based on orientation effects in which the liquid crystal remains transparent [6]
G02F 1/141
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. . . . . using ferroelectric liquid crystals [6]
G02F 1/15
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. . based on electrochromic elements [5]
G02F 1/153
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. . . Constructional arrangements [5]
G02F 1/155
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. . . . Electrodes [5]
G02F 1/157
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. . . . Structural association of optical devices, e.g. reflectors or illuminating devices, with the cell [5]
G02F 1/161
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. . . . GasketsSpacersSealing of the cellFilling or closing of the cell [5]
G02F 1/163
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. . . Operation of electrochromic cellsCircuit arrangements [5]
G02F 1/167
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. . based on electrophoresis [5]
G02F 1/17
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. . based on variable absorption elements (G02F 1/015-G02F 1/167 take precedence) [2, 5]
G02F 1/19
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. . based on variable reflection or refraction elements (G02F 1/015-G02F 1/167 take precedence) [2, 5]
G02F 1/21
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. . by interference [2]
G02F 1/225
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. . . in an optical waveguide structure [5]
G02F 1/23
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. . for the control of the colour (G02F 1/03-G02F 1/21 take precedence) [2]
G02F 1/25
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. . . as to hue or predominant wavelength [2]
G02F 1/29
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for the control of the position or the direction of light beams, i.e. deflection [4]
G02F 1/295
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. . in an optical waveguide structure (G02F 1/313, G02F 1/335 take precedence) [5]
G02F 1/31
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. . Digital deflection devices (G02F 1/33 takes precedence) [2]
G02F 1/313
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. . . in an optical waveguide structure [5]
G02F 1/315
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. . . based on the use of controlled total internal reflection [3]
G02F 1/33
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. . Acousto-optical deflection devices [2]
G02F 1/335
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. . . having an optical waveguide structure [5]
G02F 1/35
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Non-linear optics [2, 5]
G02F 1/355
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. . characterised by the materials used [7]
G02F 1/361
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. . . Organic materials [7]
G02F 1/365
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. . in an optical waveguide structure (G02F 1/377 takes precedence) [7]
G02F 1/37
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. . for second-harmonic generation [2]
G02F 1/377
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. . . in an optical waveguide structure [7]
G02F 1/383
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. . . . of the optical fibre type [7]
G02F 1/39
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. . for parametric generation or amplification of light, infra-red, or ultra-violet waves [2]
G02F 2/00
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Demodulating lightTransferring the modulation of modulated lightFrequency-changing of light (G02F 1/35 takes precedence) [2]
G02F 3/00
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Optical logic elementsOptical bistable devices [5]
G02F 7/00
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Optical analogue/digital converters
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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