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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
Dennis Berry
Jean-Marc
André Rouyer
Pierre
