Improvements introduced in the sound emitting devices (Machine-translation by Google Translate, not legally binding)

摘要

Improvements introduced in the sound emitting devices, whose improvements consist mainly and at the same time as providing the emitting device of the genre in question with a sound reflector in order to have such a reflector surface of this reflector, which converges at least a part of the sound energy towards a focus located externally to the reflector and downstream of the outlet opening thereof. (Machine-translation by Google Translate, not legally binding)