Megaphone

Megaphone apparatus

Membranous-vibration sound absorbing materials

Metal cavitated sandwich structures

Method and apparatus for a loudspeaker assembly

Method and apparatus for absorbing sound

Method and apparatus for acoustical damping of punching machines

Method and apparatus for acoustical partition

Method and apparatus for actively influencing the intake...

Method and apparatus for altering and/or minimizing...

Method and apparatus for attaching a resonance chamber to an...

Method and apparatus for attenuating sound

Method and apparatus for control of fluids

Method and apparatus for controlling noise

Method and apparatus for coupling a cylinder head--suction muffl

Method and apparatus for exhaust sound attenuation on...

Method and apparatus for improved noise attenuation in a...

Method and apparatus for minimizing pulsations in fluid transmis

Method and apparatus for noise reduction

Method and apparatus for noise suppression in a fluid line