| 13/00 | Arrangements for influencing the relationship between signals at input and output, e.g. differentiating, delaying |
| 13/02 | Arrangements for influencing the relationship between signals at input and output, e.g. differentiating, delaying to yield a signal which is a function of two or more signals, e.g. sum, product |
| 15/00 | Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path |
| 15/02 | Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path simultaneously, i.e. using frequency division |
| 15/04 | Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path simultaneously, i.e. using frequency division the signals being modulated on carrier frequencies |
| 15/06 | Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path successively, i.e. using time division |
| 15/08 | Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path successively, i.e. using time division the signals being represented by amplitude of current or voltage in transmission link |
| 15/10 | Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path successively, i.e. using time division the signals being represented by frequencies or phase of current or voltage in transmission link |
| 15/12 | Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path successively, i.e. using time division the signals being represented by pulse characteristics in transmission link |
| 17/00 | Arrangements for transmitting signals characterised by the use of a wireless electrical link |
| 17/02 | Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link |
| 17/04 | Arrangements for transmitting signals characterised by the use of a wireless electrical link using magnetically coupled devices |
| 17/06 | Arrangements for transmitting signals characterised by the use of a wireless electrical link using capacity coupling |
| 19/00 | Electric signal transmission systems (G08C 17/00 takes precedence) |
| 19/02 | Electric signal transmission systems (G08C 17/00 takes precedence) in which the signal transmitted is magnitude of current or voltage (G08C 19/36, G08C 19/38 take precedence) |
| 19/04 | Electric signal transmission systems (G08C 17/00 takes precedence) in which the signal transmitted is magnitude of current or voltage (G08C 19/36, G08C 19/38 take precedence) using variable resistance |
| 19/06 | Electric signal transmission systems (G08C 17/00 takes precedence) in which the signal transmitted is magnitude of current or voltage (G08C 19/36, G08C 19/38 take precedence) using variable inductance |
| 19/08 | Electric signal transmission systems (G08C 17/00 takes precedence) in which the signal transmitted is magnitude of current or voltage (G08C 19/36, G08C 19/38 take precedence) using variable inductance differentially influencing two coils |
| 19/10 | Electric signal transmission systems (G08C 17/00 takes precedence) in which the signal transmitted is magnitude of current or voltage (G08C 19/36, G08C 19/38 take precedence) using variable capacitance |
| 19/12 | Electric signal transmission systems (G08C 17/00 takes precedence) in which the signal transmitted is frequency or phase of ac |