DEVICE FOR TRAINING TELEPHONISTS von POPOV,METODI K, TODOROV,TENKO B, MOLLOV,VASIL K, TOSHKOV,NIKOLAJJ D, NEDELCHEV,PLAMEN N, UZUNOV,STEFAN G, TODOROVA,MARGARITA K, CONOV,DENCHO D, TODOROV,GEORGI S, KREZHOV,ASPARUKH A

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