A. Genin
— Nahum Beychik, inventor
Василий Бокарев
— Surkov, master
Kuzma Yastrebetsky
— Lopatin
Aleksandr Duletov
— Kuzma, Surkov's son
Николай Акимов
— Factory secretary
Ye. Bondina
— Lopatina
Т. Соколовская
— Nadya
F. Tarasov
— Worker
S. Stepanov
— Worker
V. Snezhinskaya
— (uncredited)
Viktor Arkasov
— Worker (uncredited)
Иван Мутанов
— Worker (uncredited)