Nikolai Simonov
Ivanov, factory worker and inventor
Petr Kuznetsov
Dukalskiy, engineer from Moscow
Natalya Razumova
Nastya, Ivanov's fiancée
Sergei Troitsky
Kraft, technical office representative
Petr Shidlovsky
Babkin, jewelry shop owner
Alexandr Rzheshevsky
Important man
