LANGUAGE INSTRUCTION KITS, WHICH INCLUDE ACOUSTICALLY ISOLATED STUDENT BOOTH AND WORK TABLE, CONTROL PANEL WITH LESSON CHANNEL SWITCH FOR CHOICE OF MULTIPLE LESSON SOURCES, VOLUME CONTROL SWITCH, CALL SWITCH, MICROPHONE, EARPHONES FOR IMMEDIATE HEARBACK WHEREBY THE STUDENT HEARS HIS OWN VOICE AS HE REPEATS THE LESSON AND FOR COMMUNICATION WITH THE INSTRUCTOR, AND AMPLIFIER, RECORDER JACK AND ELECTRICAL CIRCUITRY AND INCLUDING CONTROL ENCLOSURE BOX FLUSH MOUNTED IN DESK, SAID KITS ALSO BEING K...