Coded matrix for teaching device

Claim 1

IN A TEACHING SYSTEM, A TESTING DEVICE COMPRISING A CIRCUIT FOR INDICATING A DISIRED RESPNSE TO A STIMULANT, A MATRIX COUPLED TO SAID CIRCUIT FORMED OF PLURALITY OF SPACED CONDUCTOR BARS, EACH OF SAID BARS HAVING A GROUP OF SEGMENTS SPACED ALONG THE LENGTH THEREOF WITH ELECTRICALLY CONDUCTIVE SPACES BETWEEN SAID SAID SEGMENTS COUPLED TO SAID CIRCUIT FOR INDICATING A DESIRED RESPONSE TO A STIMULANT, AID ELECTRICALLY CONDUCTIVE SPACES OF THE CONDUCTOR BARS BEING ARRANGED TO PROVIDE A VARIETY OF CODED INFORMATION, A PENETRABLE SHIELD COVERING AND CONCEALING SAID CONDUCTOR BARS FROM VIEW, SAID PENETRABLE SHIELD BEING FORMED OF A PLURALITY OF LINGITUDINAL STRIPS OF RESILIENT MATERIAL ADJACENTLY ARRANGED WITH THEIR SIDE EDGES IN SUBSTANTIALLY ABUTTING RELATIONSHIP, EACH OF SAID SUBSTANTIALLY ABUTTING EDGES BEING DISPOSED ABOVE AND ALONE EACH CORRESPONDING CONDUCTOR BAR, AN ELECTRICALLY CONDUCTIVE PROBE MEANS CONNECTED TO SAID CIRCUIT FOR CONTACTING AN ELECTRICALLY CONDUCTIVE SPACE OF A CODED BAR BY INSERTION THROUGH SAID PENETRABLE SHIELD, AND SIGNAL MEANS COUPLED TO SAID CIRCUIT FOR INDICATING SAID RESPONSE WHEN AN ELECTRICALLY CONDUCTIVE SPACE IS CONTACTED BY SAID PROBEL.