AUDIO FREQUENCY ELECTRONIC AMPLIFIERS; AUTOMATIC PROGRAM CONTROLLED SOUND SYSTEMS SOLD AS A UNIT FOR USE FOR CHURCHES, INSTITUTIONS, BUILDINGS, ETC. SAID UNITS HAVING AN AMPLIFIER CONNECTABLE WITH A LOUD SPEAKER AND A SOURCE OF AUDIO VIBRATIONS INCLUDING RECORD PLAYERS AND RECORD CHANGERS ELECTRICAL KEYBOARD AND MECHANICALLY OPERATED ELECTRIC CHIME AND BELL ELEMENTS HAVING A VIBRATOR WITH AN ASSOCIATED ELECTRIC PICK-UP CONNECTABLE WITH AN AMPLIFIER AND LOUD SPEAKER FOR PRODUCING A BELL TONE; ...