Duplouich had his own design, the Verax (not your lens), that he presented to the International exhibition in Paris, 1900. But the jury made no special mention of that lens in his statement for the prize, apart than to list it among the competitors in the section of photographic lenses design : http://fotohist.blogspot.fr/2010/03/...ionale_18.html. That page shows a camera built by Duplouich with a Verax and a page of its selling booklet of 1903 announcing that kind of camera.
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