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.
Boris Livanov
Boris Svetlov
Maksim Shtraukh
Andrei Abrikosov
Sergei Tsenin
Viktor Stanitsyn
Oswald Glazunov
Vera Maretskaya
Vladimir Uralskiy
Dmitriy Kara-Dmitriev
Aleksey Dolinin
Sergey Tikhonravov
Leonid Kulakov
N. Golitsyna
Ivan Lavrov
Lyudmila Glazova
Marta Aleshchenko
Timofey Remizov
Yeva Milyutina
Ivan Chuvelyov
Leonid Obolensky
Weyland Rodd Sr.
Eduard Gunn