(under subclass 148) Subject matter wherein the vibrated
means is substantially enclosed and a portion of a radiation wave from the rear of the vibrated means is propagated forward after a shift or modification of the wave.
(1) Note. The enclosure has only openings for sound to be emitted. An enclosure which has no top, back or, etc., will be found above.
(2) Note. A grille of cloth or other material that sound passes through is not considered a reflector for this subclass.
