1. Original device (at founding)

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This was the mark under which the collection was founded, after Jean de Tournes.

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2. Current device

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As the focus consolidated around the Estienne press, a new device, after Robert Estienne, was adopted to reflect that shift. The original remains part of the Library's history and continues to be documented alongside the current mark.

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On the ⨋ emblem​

A single emblem, ⨋, recurs across both devices used by Deltian Library, and also serves as the personal mark of Efe Metin Çetin.