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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
G03
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PHOTOGRAPHYCINEMATOGRAPHYANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVESELECTROGRAPHYHOLOGRAPHY [4]
G04
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HOROLOGY
G04B
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MECHANICALLY-DRIVEN CLOCKS OR WATCHESMECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERALTIME-PIECES USING THE POSITION OF THE SUN, MOON, OR STARS (spring- or weight-driven mechanisms in general F03G; electromechanical clocks or watches G04C; electromechanical clocks with attached or built-in means operating any device at preselected times or after predetermined time intervals G04C 23/00; clocks or watches with stop devices G04F 7/08; structural details or housings specially adapted for electronic time-pieces with no moving parts G04G 17/00)
G04B 1/00
Driving mechanisms
G04B 1/00
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Driving mechanisms
G04B 3/00
Winding
G04B 3/00
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Normal winding of clockworks by hand or mechanicallyWinding-up several mainsprings or driving weights simultaneously
G04B 5/00
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Automatic winding-up
G04B 7/00
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Combined normal and automatic winding-up
G04B 9/00
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Supervision of the state of winding, e.g. indicating the amount of winding
G04B 11/00
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Click devices, stop clicks or clutches for winding
G04B 13/00

G04B 13/00
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Gearwork
G04B 15/00
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Escapements (electric or magnetic means for converting oscillatory to rotary motion in electromechanical time-pieces G04C 5/00)
G04B 17/00
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Mechanisms for stabilising frequency [3]
G04B 18/00
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Mechanisms for setting frequency [3]
G04B 19/00
Time indicating
G04B 19/00
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Indicating the time by visual means (by electric lamps G04C 17/02; display arrangements in general G09)
G04B 21/00
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Indicating the time by acoustic means (at preselected times G04B 23/00; by electro-acoustic means G04C 21/04; sound-producing apparatus per seG10)
G04B 23/00
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Arrangements producing acoustic signals at preselected times (electrically-released alarm signals G04C 21/00; metronomes G04F 5/02; sound-producing apparatus per seG10)
G04B 25/00
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Indicating the time by other means or by combined means (electric or electromechanical indicating G04C)
G04B 27/00
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Mechanical devices for setting the time-indicating means
G04B 29/00
Frameworks, supports, or arrangements of the clockwork parts in relation to each other, so-called "calibers"
G04B 29/00
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Frameworks
G04B 31/00
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BearingsPoint suspensions or counter-point suspensionsPivot bearingsSingle parts therefor (bearings in general F16C)
G04B 33/00
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Calibers
G04B 33/02
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Circular calibers
G04B 33/04
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Non-circular calibers
G04B 33/06
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of extremely flat shape
G04B 33/08
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in which the gear train is arranged in different planes, e.g. parallel or inclined to each other (G04B 33/10 takes precedence)
G04B 33/10
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with seconds hand arranged in the centre of the dial
G04B 33/12
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for extremely-long running times
G04B 33/14
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Calibers of which the mainsprings or barrels are easily removable (mainsprings G04B 1/14; barrels, arbors G04B 1/16)
G04B 33/16
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with arrangements affording protection of the clockwork against damage as a consequence of a rupture of the mainspring
G04B 35/00
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Adjusting the gear train, e.g. the backlash of the arbors, depth of meshing of the gears
G04B 37/00
Protection of the clockwork against damage from outside
G04B 37/00
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Cases
G04B 39/00
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Watch crystalsFastening or sealing crystalsClock glasses
G04B 41/00
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Locking or holding devices for pendulums, chimes, or the like, for use during transport
G04B 43/00
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Protecting clockworks by shields or other means against external influences, e.g. magnetic fields
G04B 45/00
Clocks with unusual features
G04B 45/00
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Time-pieces of which the indicating means or cases provoke special effects, e.g. aesthetic effect (ornamental shaping of dials G04B 19/10)
G04B 47/00
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Time-pieces combined with other articles which do not interfere with the running or the time-keeping of the time-piece (G04B 37/12 takes precedence; writing or drawing implements with devices for indicating time B43K 29/087; combinations with vehicle mirror assemblies B60R 1/12; combined with cameras, projectors, or photographic printing apparatus G03B 29/00)
G04B 49/00

G04B 49/00
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Time-pieces using the position of the sun, moon, or stars
G04B 99/00
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Subject matter not provided for in other groups of this subclass [2006.01]
G04C
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ELECTROMECHANICAL CLOCKS OR WATCHES (mechanical parts of clocks or watches in general G04B; electronic time-pieces with no moving parts, electronic circuitry for producing timing pulses G04G)
G04D
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APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES (machine tools in general B23, B24; hand tools in general B25)
G04F
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TIME-INTERVAL MEASURING (measuring pulse characteristics G01R, e.g. G01R 29/02; in radar or like systems G01S; masers H01S 1/00; generation of oscillations H03B; generation or counting of pulses, frequency dividing H03K; analogue/digital conversion in general H03M 1/00) [2]
G04G
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ELECTRONIC TIME-PIECES [3]
G04R
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RADIO-CONTROLLED TIME-PIECES [2013.01]
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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