Aparatul este conceput sa numere diferite obiecte, care circula pe benzile rulante din fabrici. Este compus dintr-o fotocelula, care atunci cind prin fata sa trec obiectele, intrerupe fluxul luminos dat de bec, se atrage releul, care este conectat la colectorul tranzistorului EFT 353. Acest releu alimenteaza mai departe un releu, care este conectat in colectorul tranzistorului EFT 353. Acest releu alimenteaza mai departe un releu numarator care numara obiectele ce trec prin fata fotocelulei.
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