Matches 301 - 344 out of 344 < 1 2 3 4 5 6 7
Match Document Document Title
3243511 Amplifier circuit  
3229049 Hearing aid  
3207848 Amplifying circuit for capacitive microphones  
3201516 Capsule-enclosed electro-acoustic transducer and transistor amplifier  
3194887 Personal microphone line transformer  
3192320 Audio amplifier with modulated switching input for stored charge pulse generator  
3185768 Amplifier circuit  
3183305 Portable sound system  
3178512 Electrical sound reproducing device  
3177288 Operating circuit for a discharge type of transducer  
3176071 Electronic sound transmission  
3156769 Stereophonic tonal output from single audio input channel  
3154639 Compensating diode for complementary symmetry circuit  
3142724 Audio system  
3132207 Microphone amplifier  
3116366 Capacitive source signal generators  
3106609 Automobile speaker system  
3061677 Resistive control for electronic circuits  
3054863 Magnetic feedback suppression between battery-cell and a transistor amplifier  
3052758 Column speakers suitable for use in public address systems  
3051788 Amplifier interconnecting circuit  
3015704 Acoustical apparatus  
3014995 Transistor hearing aid  
3011025 High power amplifier  
2969530 Sound montoring circuitry and instrument  
2967913 Electronic intensifying ear-drum  
2952739 Hands-free telephone support  
2950357 Electronic sound transmitting device  
2930857 Spectacles concealed hearing-aid  
2929877 Microphone unit  
2929028 Audio amplifier  
2922846 Audio amplifier system  
2909619 Improved hearing-aid  
2907837 Sound reproducing system  
2870255 Microphone assembly  
2868877 All-magnetic audio amplifier system  
2848538 Magnasonic hearing aid device  
2847506 Receiver amplifier  
2810786 Directional microphone system  
2807665 Reduction of distortion in amplifying systems  
2805285 Circuit-arrangement for operating a loudspeaker installation  
2797315 Portable loud-speaker type radio receiver with battery-saving earphone circuit  
2791629 Monitoring system for stereophonic sound channels  
0991304 Title is not available  
Matches 301 - 344 out of 344 < 1 2 3 4 5 6 7