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| More topics under "H04B - Transmission" (547,929) |
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| H04B 1 - Details of transmission systems, not covered by a single one of groups; Details of transmission systems not characterised by the medium used for transmission (188,568) | | H04B 10 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication (73,125) | | H04B 11 - Transmission systems employing ultrasonic, sonic or infrasonic waves (1,545) | | H04B 13 - Transmission systems characterised by the medium used for transmission, not provided for in groups (1,959) | | H04B 14 - Transmission systems not characterised by the medium used for transmission (7,274) | | H04B 15 - Suppression or limitation of noise or interference (10,227) | | H04B 17 - Monitoring; Testing (29,423) | | H04B 3 - Line transmission systems (31,523) | | H04B 5 - Near-field transmission systems, e.g. inductive loop type (17,859) | | H04B 7 - Radio transmission systems, i.e. using radiation field (186,426) |
| Patents for H04B - Transmission (2,303) |
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| 12/24/1981 | WO1981003728A1 Subscriber line audio processing circuit apparatus | | 04/20/1976 | US3952252 Noise suppressor for telecommunication system | | 03/23/1976 | US3946249 Signal control circuit |
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