Ladders of metal; Metal ladders; Metal step ladders; Metal step stools; Metal stepladders and ladders

Radio sets; Tape recorders; Audio-video receivers; Acoustic membranes; Microphones; Internet radios; Loudspeakers; Horns for loudspeakers; Sound transmitting apparatus; Cabinets for loudspeakers; Subwoofers; Telephones incorporating intercommunication systems; Portable radios; Sound recording apparatus; Megaphones; Portable media players; Pickups for telecommunication apparatus; Headphones in the form of headbands; Earphones; Amplifiers for musical instruments