Learning laboratory audio distribution apparatus

Claim 1

FOR USE IN A LEARNING LABORATORY HAVING A SOURCE OF A PLURALITY OF INSTRUCTIVE PROGRAM SIGNALS, A TEACHER AUDIO INPUT MEANS, OUTPUT MEANS AND RECORDING MEANS AND A PLURALITY OF STUDENT STATIONS EACH HAVING STUDENT AUDIO INPUT AND OUTPUT MEANS; AUDIO SIGNAL DISTRIBUTION APPARATUS FOR EACH OF SAID STUDENT STATIONS, EACH OF SAID DISTRIBUTION APPARATUS COMPRISING: (A) MULTIPLE POSITION PROGRAM SELECTOR MEANS HAVING A PLURALITY OF CONTACTS EACH CONNECTED TO ONE OF SAID PROGRAM SIGNALS AND A SINGLE CONTACT FOR SELECTIVELY ENGAGING SAID PLURAL CONTACTS, (B) MULTIPLE POSITION FUNCTION SELECTOR MEANS HAVING A FIRST PLURALITY OF THREE STATIONARY CONTACTS SELECTIVELY ENGAGED BY A FIRST MOVABLE CONTACT, AND A SECOND PLURALITY OF THREE STATIONARY CONTACTS SELECTIVELY ENGAGED BY A SECOND MOVABLE CONTACT MECHANICALLY GANGED TOGETHER WITH SAID FIRST MOVABLE CONTACT, SAID FIRST AND SECOND PLURALITY OF THREE STATIONARY CONTACTS HAVING CORRESPONDING POSITIONS ONE, TWO, AND THREE, (C) SAID FIRST MOVABLE CONTACT BEING CONNECTED TO SAID STUDENT AUDIO INPUT MEANS THREE STATIONARY CONTACTS OF SAID FIRST PLURALITY, CORRESPONDING TO POSITION ONE, TWO AND THREE, CONNECTED IN COMMON TO THE SINGLE CONTACT OF SAID PROGRAM SELECTOR FOR COUPLING A SELECTED PROGRAM SIGNAL TO SAID STUDENT AUDIO INPUT MEANS WHEN ENGAGED BY SAID FIRST MOVABLE CONTACT, (D) FIRST AND SECOND CONDUCTORS, (E) ONE OF SAID STATIONARY CONTACTS OF SAID SECOND PLURALITY CONNECTED THROUGH SAID FIRST CONDUCTOR TO SAID RECORDING MEANS, ANOTHER ONE OF SAID STATIONARY CCONTACTS OF SAID SECOND PLURALITY CONNECTED THROUGH SAID SECOND CONDUCTOR TO SAID TEACHER AUDIO INPUT MEANS, A THIRD ONE OF SAID STATIONARY CONTACTS OF SAID SECOND PLURALITY CONNECTED TO AN OPEN CIRCUIT.