Fingering attachment for stringed instruments

Fingering device for self-playing stringed instruments

Fingering device for self-playing stringed instruments

Fingering device for stringed instruments

Fingering steel for guitars

Fipple type headjoint assembly for use with existing...

Fire resistant sound absorber

Fixed cellular terminal for two-wire telecommunications...

Fixed codebook searching device and fixed codebook searching...

Flange pin clip

Flare wave-guide projector

Flat panel radiator with sound absorbing facing

Flexible vocabulary recognition

Flextensional resonant pipe projector

Flextensor acoustic transducer for deep immersion

Flexural plate sound transducer having low resonant frequency

Flip-flop driver for d.c. bell

Floor laying material, piece mat, and arranging structure...

Floor mat with voice-responsive display

Fluid exhaust silencer