Microperforated polymeric film for sound absorption and...
Mineral fibre material for absorbing impact noise
Modern door knocker
Modular buzzer with diaphragm molded into housing
Modular piezoelectric transducer component for audible...
Motion picture theater loudspeaker system
Motor actuated bell
Motor actuated bell
Motor actuated bell assembly
Motor driven bell sound generating system
Motor driven bell sound generating system
Motor driven type gong striking mechanism
Mounting for sound producing machines
Moving ultrasonic transducer array
Muffling panel
Multi-channel active acoustic attenuation system
Multi-channel active attenuation system with error signal...
Multi-channel adaptive canceler
Multi-composite acoustic panel for use in construction
Multi-frequency acoustic vibration transmission method and...