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electricity (6786) 6786
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transmission of digital information, e.g. telegraphiccommunication (1174) 1174
heating (1172) 1172
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blasting (1157) 1157
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electric digital data processing (928) 928
humans (923) 923
general tagging of cross-sectional technologies spanning over several sections of the ipc (877) 877
general tagging of new technological developments (877) 877
technical subjects covered by former uspc cross-reference art collections [xracs] and digests (877) 877
education (860) 860
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devices or arrangements, the optical operation of which ismodified by changing the optical properties of the medium of thedevices or arrangements for the control of the intensity,colour, phase, polarisation or direction of light, e.g.switching, gating, modulating or demodulating (818) 818
frequency-changing (818) 818
non-linear optics (818) 818
optical analogue/digital converters (818) 818
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organic chemistry (740) 740
arrangements or circuits for control of indicating devicesusing static means to present variable information (735) 735
materials science (733) 733
processes or means, e.g. batteries, for the direct conversionof chemical into electrical energy (704) 704
pictorial communication, e.g. television (699) 699
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coffee mills (341) 341
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suction cleaners in general (341) 341
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electric lighting not otherwise provided for (337) 337
aged (325) 325
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multiplex communication (317) 317
engineering elements and units (311) 311
general measures for producing and maintaining effectivefunctioning of machines or installations (311) 311
thermal insulation in general (311) 311
physical or chemical processes or apparatus in general (308) 308
reduction of greenhouse gas [ghg] emissions, related to energygeneration, transmission or distribution (305) 305
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English (21872) 21872
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