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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 (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)
G08B
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SIGNALLING OR CALLING SYSTEMSORDER TELEGRAPHSALARM SYSTEMS (signalling arrangements on vehicles B60Q, B62D 41/00; railway signalling systems or devices B61L; on cycles B62J 3/00, B62J 6/00; safes or strong-rooms with alarm devices E05G; signalling or alarm devices in mines E21F 17/18; sensitive measuring elements, see the appropriate subclasses of G01; traffic control systems G08G; visual indicating means G09; sound-producing devices G10; radio or near-field calling systems H04B 5/00, H04B 7/00;  loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers H04R)
G08B 1/00
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Systems for signalling characterised solely by the form of transmission of the signal
G08B 3/00
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Audible signalling systemsAudible personal calling systems (audible indication of time signals G04B 21/00, G04C 21/00)
G08B 5/00
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Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied (display of time signals G04B 19/00, G04C 17/00, G04C 19/00, G04G 9/00; for display of alphanumeric information G09F; flags, banners G09F)
G08B 6/00
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Tactile signalling systems, e.g. personal calling systems (indication of time by feeling G04B 25/02; deaf-aid sets H04R 25/00) [6]
G08B 7/00
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Signalling systems according to more than one of groups G08B 3/00-G08B 6/00 (combinations of display arrangements with audible advertising G09F 27/00)Personal calling systems according to more than one of groups G08B 3/00-G08B 6/00
G08B 9/00
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Order telegraph apparatus, i.e. means for transmitting one of a finite number of different orders at the discretion of the user, e.g. bridge to engine room orders in ships (signalling devices in mines E21F 17/18)
G08B 13/00
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Burglar, theft, or intruder alarms (vehicle theft alarms B60R 25/10; cycle theft alarms B62H 5/00)
G08B 15/00
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Identifying, scaring, or incapacitating burglars, thieves, or intruders, e.g. by explosives (burglar traps, or the like, on safes E05G 5/02)
G08B 17/00
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Fire alarmsAlarms responsive to explosion (temperature-responsive elements G01K)
G08B 17/02
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Mechanical actuation of the alarm, e.g. by the breaking of a wire
G08B 17/04
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Hydraulic or pneumatic actuation of the alarm, e.g. by change of fluid pressure
G08B 17/06
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Electric actuation of the alarm, e.g. using a thermally-operated switch (thermally-operated electric switches per seH01H 37/00)
G08B 17/08
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Actuation involving the use of explosive means
G08B 17/10
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Actuation by presence of smoke or gases
G08B 17/103
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. . using a light emitting and receiving device [5]
G08B 17/107
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. . . for detecting light-scattering due to smoke [5]
G08B 17/11
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. . using an ionisation chamber for detecting smoke or gas (vacuum gauges making use of ionisation effects G01L 21/30; gas analysis by investigating the ionisation G01N 27/62) [5]
G08B 17/113
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. . . Constructional details (discharge tubes for measuring pressure of introduced gas, or for detecting presence of gas, in general H01J 41/02) [5]
G08B 17/117
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. . by using a detection device for specific gases, e.g. combustion products, produced by the fire (G08B 17/103, G08B 17/11 take precedence; investigating or analysing gases in general G01N, e.g. by using electric means G01N 27/00) [5]
G08B 17/12
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Actuation by presence of radiation or particles, e.g. of infra-red radiation, of ions
G08B 19/00
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Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
G08B 21/00
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Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
G08B 23/00
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Alarms responsive to unspecified undesired or abnormal conditions
G08B 25/00
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Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
G08B 26/00
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Alarm systems in which substations are interrogated in succession by a central station
G08B 27/00
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Alarm systems in which the alarm condition is signalled from a central station to a plurality of substations
G08B 29/00
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Checking or monitoring of signalling or alarm systemsPrevention or correction of operating errors, e.g. preventing unauthorised operation
G08B 31/00
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Predictive alarm systems characterised by extrapolation or other computation using updated historic data [5]
G08C
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TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS (fluid pressure transmission systems F15B; sensing members for specific physical variables, see the relevant subclasses, e.g. of G01, of H01; indicators or recorders, see the relevant subclasses, e.g. G01D, G09F; mechanical means for transferring the output of a sensing member into a different variable G01D 5/00; self-balancing bridges G01R; position control in general G05D 3/00; mechanical control systems G05G; systems for transmitting "on/off" signals only, systems for transmitting alarm conditions G08B; order telegraph systems G08B 9/00; generating electric pulses H03K; coding, decoding or code conversion, in general H03M; transmission of digital information H04L; selective calling from one station to another H04Q 9/00) [4]
G08G
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TRAFFIC CONTROL SYSTEMS (guiding railway traffic, ensuring the safety of railway traffic B61L; arrangement of road signs or traffic signals E01F 9/00; radar systems or analogous systems, designed for traffic control G01S 13/91; sonar or lidar systems specially designed for traffic control G01S 15/88, G01S 17/88) [2]
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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