Pyotr Vinogradov, inventor

Senya Kaufman

Kotya Okhotnikov

Valya, music student

Tonya, architecture student

Physical education instructor (uncredited)

Senya's mother (uncredited)

Red army sailor (uncredited)

Young girl (uncredited)

Professor (uncredited)

Spectator at the concert (uncredited)

Middle aged woman (uncredited)

Writing

Writing

Camera

Directing

Sound

Sound

Art