Power whistle
Pressure lock marine horn
Pressurized fluid powered horn
Pressurized fluid-actuated sound-producing device, and method of
Radio station identifier
Rechargeable air horn and method of using the same
Road condition indicator device
Rotation indicators for cassette reels
Schedule and record indicator
Scuba whistle
Scuba whistle
Self-purging pneumatic acoustic generator
Single-housing multi-trumpet air horn
Sound producing device
Stock control indicating means
Tea kettle flute
Tea kettle whistle
Toroidal shaped closed chamber whistle
Toroidal whistle
Two-tone sound generator