The means used by foreign spy services to obtain the trade secret of a French invention.
Claude Rollet
Yves Rubin
Danielle Godet
Sonia
Paul Préboist
Léon Prades
Jacques Galland
Robert Alexandre
Henri Lambert
Dabillaud
Daniel Prévost
Mario
Michèle Chemin
Janine
Christine Aurel
Irène
