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SPEAKER BAFFLES, CABINETS FOR VARIOUS ELECTRONIC COMPONENTS, VOLTAGE POWER SUPPLY UNITS, ANNUNCIATOR PANELS, AM/FM TUNERS, PREAMPLIFIER AND AMPLIFIER UNITS, POWER AMPLIFIERS, MULTI-INPUT AMPLIFIERS, CONTROL PANELS, ANNUNCIATOR SWITCH PANELS, TIME SELECTOR PANEL SWITCHES, ELECTRONIC EQUIPMENT RACKS, MASTER STATION CONTROL PANELS, READOUT PANEL SYSTEMS, MESSAGE PROGRAMMERS, TAPE RECORDER PREAMPLIFIERS, INTERCOM TELEPHONES, WIRE AND CABLE, REMOTE INTERCOM STATIONS, AND SCHOOL SOUND SYSTEMS