Miniaturised electroacoustic hearing aid - has aesthetic mould housing and clip for wearing as earing or hair clip
CH673551A5
Hearing aid with direct audio input connection - provided by audio plug fitted into battery compartment upon battery removal
CH669296A5
Electroacoustic hearing aid with contact for external equipment - has battery compartment adapted to accept plug connection from external broadcast receiver or voice communication appts.
CH668154A5
Hearing aid with electroacoustic transducer - fits behind ear and has facility for plugging in range of operational mode elements
CH663684A5
Electrical rotary switch
CH600727A5
Hearing aid with IR detector
CH581830A5
Electro-optical fluid sensor monitor for filling level of container - has light transmissive body with one end shaped as truncated cone
CH577238A5
Plastics terminal strip for connector block prodn. - forms wire channels in one piece with hollow inserts by injection, moulding
CH583489A5
Microphone capsule for telephone - has preamplifier filter and main amplifier coupled to electret microphone
FR2244391A8
Hearing aid with directional microphone - has device converting microphone lobe characteristic into spherical characteristic
CH564762A5
Indication of liquid level in chamber - uses two sensor elements attached at different heights
