Tamper-proof alarm bell assembly
The use of acoustic crystals for the inhibition of sound...
Thermo formable acoustical panel
Thermoformable acoustic sheet material
Tilt-operated hand held gas powered acoustic device
Timer ramp-up circuit and method for a sound masking system
Tinnitus masking device
Tone generator
Tone generator
Tone selective receiver
Toroidal whistle
Tracking filter for periodic signals
Transducer apparatus responsive to external perturbation
Transducers, devices and systems containing the transducers,...
Tunable acoustic reflector
Tunable acoustic system
Tuned musical handbell made of aluminum