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
Sanitary stethoscope
Sea-shell stethoscope head
Sealing of hearing aid to ear canal