loudspeakers; cabinets for loudspeakers; radios; horns for loudspeakers; audio- and video-receivers; electroacoustic transducers; headphones; apparatus for recording, transmission or reproduction of sound; sound transmitting apparatus; acoustic membranes

Loudspeakers; cabinets for loudspeakers; radios; horns for loudspeakers; audio- and video-receivers; electroacoustic assemblies; headphones; apparatus for recording sound; sound transmitting apparatus; diaphragms acoustics