Symmetric double phonic diaphragm volume-enhancing device

Symmetrical air friction enclosure for speakers

Symmetrical speaker having structural reinforcing ports

Synchronized acoustic source

Synchronized acoustic source

Synchronized multiple transducer system

Synchronous common polar resonant wall type speaker cabinet

Synchronous dustproof cover structure for sound membrane

Synthetic horn projector with metal insert

Synthetic tympanic membrane

System and method for a combined rotatable mechanical and...

System and method for an improved device for measuring water...

System and method for determining the distribution and orientati

System and method for eliminating wave form distortion in multi-

System and method for fastening insulating layers to a support s

System and method for ignition of a gaseous or dispersed...

System and method for monitoring drill string characteristics du

System and method for noise suppression

System and method for phased noise attenuation

System and method for phases noise attenuation