DK2050C -
Device for the reduction of such disturbing noises in telephones which are caused by the operation of plants by which a transmission of electric power takes place.
- Google Patents
Device for the reduction of such disturbing noises in telephones which are caused by the operation of plants by which a transmission of electric power takes place.
DK2050D
Device for the reduction of such disturbing noises in telephones which are caused by the operation of plants by which a transmission of electric power takes place.
DK2050C
(en)
Device for the reduction of such disturbing noises in telephones which are caused by the operation of plants by which a transmission of electric power takes place.
Device for the reduction of such disturbing noises in telephones which are caused by the operation of plants by which a transmission of electric power takes place.