Rear deck mounting adapter for car speaker
Rear deck mounting adapter for car speaker
Rearward sound enhancing apparatus
Rearward sound enhancing apparatus
Receiver structure of stethoscope
Receiver support and earmold for a hearing device as well as...
Receiver suspension and acoustic porting system
Reflex horn speaker with a waterproofing device
Reporting device
Resolution enhanced sound detecting apparatus
Resonant electroacoustic transducer with increased band width re
Retention and extraction device for a hearing aid
Retention and extraction device for a hearing aid
Retractable ear protection device
Reversible electroacoustic transducer device having a constant d
Ribbed conical-central dome diaphragm with tapered thickness com
Ribbon loudspeaker
Ribbon type speaker and method of assembling magnetic circuit th
Rigid-diaphragm transducer with plural coils
Roof fan