The invention relates to a device consisting in that all or part of the adhesive conveyor belt contains sensitive surfaces, at least equal in number to the number of possible potential images of another sensitive surface incorporated with this belt at the moment of processing, after photographing, characterised in that this conveyor belt contains chemical products allowing constant-value processing. 1 (abstract) represents this belt, 1, 18, the start of the belt, 1, 14 the adhesive zone reserved for the introduction of a film after photographing, 1, 15, 16, 17 the chemical products, 1, 13 chemical products converting the film developer into paper developer, 1, 12 sensitive surfaces for tests, 1, 11 sensitive surfaces corresponding to the number of shots of the film introduced, 1, 1 a cartridge containing this assembly, which opens automatically after passage of the start of the belt through the machine. IMAGE
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