Николай Симонов

Ivanov, factory worker and inventor

Пётр Кузнецов

Dukalskiy, engineer from Moscow

Наталья Разумова

Nastya, Ivanov's fiancée

Сергей Троицкий

Kraft, technical office representative

Petr Shidlovsky

Babkin, jewelry shop owner

Александр Ржешевский

Important man