21 [ TELEVISION RECEIVING SETS MOUNTED IN CABINETS; TELEVISION CHASIS, WITH OR WITHOUT RADIO RECEIVING SETS AND/OR SOUND REPRODUCING DEVICES SUCH AS RECORD PLAYERS, AND PARTS THEREOF; SOUND APPARATUS-NAMELY, INTERCOMMUNICATING, SOUND AMPLIFYING AND TRANSMITTING APPARATUS COMPRISING SPEAKERS, AMPLIFIERS, MICROPHONES AND INTERCONNECTING CIRCUITS, PAGING, PUBLIC ADDRESS, AND ANNOUNCING SYSTEMS AND PARTS THEREOF; AND ] AUTOMATIC TELEPHONE SYSTEMS AND PARTS THEREOF