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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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MEASURING (counting G06M)TESTING
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
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 devicesStop clicksClutches
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 by visual means (by electric lamps G04C 17/02; display arrangements in general G09)
G04B 21/00
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Indicating 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 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 37/02
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Evacuated casesCases filled with gases or liquidsCases containing substances for absorbing or binding moisture or dust
G04B 37/04
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Mounting the clockwork in the caseShock-absorbing mountings
G04B 37/05
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. . Fixed mountings for pocket or wrist watches [3]
G04B 37/06
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Forming the passage for the winding stem through the caseDivided winding stems
G04B 37/08
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Hermetic sealing of openings, joints, passages, or slits
G04B 37/10
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. . of winding stems
G04B 37/11
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. . of the back cover of pocket or wrist watches [3]
G04B 37/12
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Cases for special purposes, e.g. watch combined with ring, watch combined with button (watch guards or protectors A45C 11/10, A45C 11/12; watches combined with cosmetic powder containers A45D 33/30)
G04B 37/14
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Suspending devices, supports, or stands for time-pieces in so far as they form part of the case (wrist-watch straps, fastening means therefor A44C 5/00)
G04B 37/16
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. . Fastening the case to the bracelet [3]
G04B 37/18
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for pocket or wrist watches (G04B 37/02-G04B 37/16 takes precedence) [3]
G04B 37/20
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. . with hinged covers or backs [3]
G04B 37/22
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Materials or processes of manufacturing pocket watch or wrist watch cases [3]
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]
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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