Teaching-aid device

Claim 1

AN ELASTIC TEACHING DEVICE COMPRISING IN COMBINATION A TEACHER DESK, A PLURALITY OF PUPIL DESKS, A PLURALITY OF REGISTERS AND A RESULT READING UNIT, SAID TEACHER DESK BEING PROVIDED WITH A MULTI-POSITION MANUAL ANSWER SELECTING MEANS, SAID MEANS ALLOWING THE TEACHER TO SELECT AN ANSWER FROM A PLURALITY OF PROPOSED ANSWERS TO A QUESTION PUT TO THE PUPILS, EACH SAID PUPIL DESK BEING PROVIDED WITH A MULTI-POSITION MANUALLY OPERATED ANSWER SELECTING MEANS, ONE SAID REGISTER BEING A QUESTION REGISTER OF THE STEP-BY-STEP SHIFTING TYPE HAVING ONE INPUT AND A PLURALITY OF OUTPUTS WHEREOF ONLY ONE OUTPUT MAY BE ENERGIZED FOR EACH INCOMING SIGNAL, A PUPIL REGISTER OF THE STEP-BYSTEP SHIFTING TYPE HAVING ONE INPUT AND A PLURALITY OF OUTPUTS WHEREOF ONLY ONE OUTPUT CAN BE ENERGIZED FOR EACH INPUT SIGNAL, A CENTRAL MEMORY UNIT FORMED OF A PLURALITY OF MEMORY CELLS AMONG WHICH THOSE NECESSARY FOR RECORDING THE ANSWERS OF EVERY PUPIL TO THE SAME QUESTION COMPRISE A CORRESPONDING "SECTION" OF CELLS AND THOSE NECESSARY FOR RECORDING THE ANSWERS OF A SINGLE PUPIL TO A PLURALIT OF QUESTIONS COMPRISE A GROUP OF CELLS, SAID CENTRAL MEMORY UNIT IS OF THE MATRIX TYPE COMPRISING COLUMNS AND LINES AND IN WHICH SAID EQUALITY DETECTOR IS CONNECTED BY MEANS OF THE PROGRAMMING UNIT TO EACH OF THE MEMORY CELLS OF ONE SECTION OF THE CENTRAL MEMORY UNIT IN A FIRST MODE OF OPERATION CALLED CHECKING ROUTINE DURING WHICH THE ANSWERS OF THE PUPILS ARE READ, AND IS CONNECTED BY MEANS OF THE PROGRAMMING UNIT TO EACH OF THE MEMORY CELLS OF ONE GROUP OF THE CENTRAL MEMORY UNIT IN A SECOND MODE OF OPERATION CALLED GENERAL QUESTIONING ROUTINE DURING WHICH THE ANSWERS OF THE CORRESPONDING PUPIL ARE