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Business stationery (cover/mailer) used by the company AGFA-GEVAERT in Leverkusen (Germany). It was sent by Dr. Johannes WILSAU, who was involved in research on silver halide photographic emulsions, to Dr. Piotr NOWAK of Katedra/Zakład Fototechniki at Technical University of Wrocław.
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- Dimanche 25 Août 2019
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