Dick Arrowsmith
Boris Livanov
Dick Arrowsmith

Not being able to implement his invention in his home country, engineer Arrowsmith, the author of the patent for ore flotation, goes to the USSR to work at one of the flotation plants, where he soon learns that a group of Soviet engineers is conducting similar work.
Dick Arrowsmith
Boris Livanov
Dick Arrowsmith
Layons
Boris Svetlov
Layons
Samuel Wolfe
Maksim Shtraukh
Samuel Wolfe
Engineer Nikitin
Andrei Abrikosov
Engineer Nikitin
Sazonov
Sergei Tsenin
Sazonov
Bill Steer
Viktor Stanitsyn
Bill Steer
Rector (uncredited)
Oswald Glazunov
Rector (uncredited)
Comrade Olga
Vera Maretskaya
Comrade Olga
Gostev
Vladimir Uralskiy
Gostev
Bistayev
Dmitriy Kara-Dmitriev
Bistayev
Gaydar
Aleksey Dolinin
Gaydar
Garreth
Sergey Tikhonravov
Garreth
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