A. Genin

as Nahum Beychik, inventor

Vasili Bokarev

as Surkov, master

Kuzma Yastrebetsky

as Lopatin

Aleksandr Duletov

as Kuzma, Surkov's son

Nikolai Akimov

as Factory secretary

Ye. Bondina

as Lopatina

T. Sokolovskaya

as Nadya

F. Tarasov

as Worker