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Symbol Select IPC entry Title
A
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HUMAN NECESSITIES
B
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PERFORMING OPERATIONSTRANSPORTING
C
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CHEMISTRYMETALLURGY
D
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TEXTILESPAPER
E
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FIXED CONSTRUCTIONS
F
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MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
G
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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
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
G08B
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SIGNALLING OR CALLING SYSTEMSORDER TELEGRAPHSALARM SYSTEMS
G08C
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TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS (fluid pressure transmission systems F15B;  mechanical means for transferring the output of a sensing member into a different variable G01D 5/00;  mechanical control systems G05G) [4]
G08C 13/00
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Arrangements for influencing the relationship between signals at input and output, e.g. differentiating, delaying [1, 2006.01]
G08C 15/00
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Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path [1, 2006.01]
G08C 17/00
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Arrangements for transmitting signals characterised by the use of a wireless electrical link [1, 6, 2006.01]
G08C 17/02
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.using a radio link [6, 2006.01]
G08C 17/04
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.using magnetically coupled devices [6, 2006.01]
G08C 17/06
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.using capacity coupling [6, 2006.01]
G08C 19/00
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Electric signal transmission systems (G08C 17/00 takes precedence) [1, 2006.01]
G08C 21/00
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Systems for transmitting the position of an object with respect to a predetermined reference system, e.g. tele-autographic system [1, 5, 2006.01]
G08C 23/00
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Non-electric signal transmission systems, e.g. optical systems [1, 2006.01]
G08C 25/00
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Arrangements for preventing or correcting errorsMonitoring arrangements [1, 2006.01]
G08G
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TRAFFIC CONTROL SYSTEMS (guiding railway traffic, ensuring the safety of railway traffic B61L; radar or analogous systems, sonar systems or lidar systems specially adapted for traffic control G01S 13/91, G01S 15/88, G01S 17/88; radar or analogous systems, sonar systems or lidar systems specially adapted for anti-collision purposes G01S 13/93, G01S 15/93, G01S 17/93; control of position, course, altitude or attitude of land, water, air or space vehicles, not being specific to a traffic environment G05D 1/00) [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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ELECTRICITY

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