The apparatus 1 comprises a data input unit (1) comprising three control buttons guides (2,3, 4), two trigger (5, 6), one OR element (7), one pulse generator (16), 2 znako- forming unit (8, 12) consisting of two counters (9, 13), 2 decoder (10, 14), two digital displays (11, 15) and one reset switch (17), one oscillator (18), one switch ( 19) 6 NC contact buttons (20, 21, 22, 23, 29, 30), 4 make contacts (24, 25. 26, 27), one additional control buttons (28). 2-5-7-25-9-10-11; 9-23-22-26-27-13-14-15; 11-10-9-17; 15-14-13- 17; 13-16-7; 18-20-26; 21-27; 29-9; 27. 4-3-6-26- 1 yl.
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