74231804
Dec 19, 1991
Nov 17, 1992
signal modulating, non-modulating and telephone adapter units for connecting audio-signal lines to hearing aids and plugs and cables for use therewith; remote control devices and parts therefor; computer programs for use by wearers of hearing aids; microphones and table microphones with or without directional characteristics for connection to hearing aids; radio receivers and transmitters for connection to hearing aids
Electrical and Scientific Apparatus