Transducers or their casings adapted for mounting in or to a wall or ceiling

Full Title

Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups > Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups > Transducers or their casings adapted for mounting in or to a wall or ceiling