The operation of the reaction keys signals "Decision taken". By operating the correct key, i.e., correct solution of the problem, "Correct solution" is additionally signalled. The operation of the correct reaction key actuates a contact pin through a hole punched in a fixed position in the film of the programme. The contact pin hits a cooperating contact and closes a second circuit. At each operation of a key, a yellow lamp flashes. If the correct key has been operated (correct answer), a yellow and green lamp flashes. The flashing of the key operation is recorded by two additional counters and evaluated.
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