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Descripción archivística
Unidad documental simple <transferring and transferring techniques> (<processes and techniques by specific type>, Processes and Techniques (hierarchy name))
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Cheiroscope viewer (optical drawing device)

This item is an optical drawing device. It was designed to trace images appearing in the reflection of the mirrors. There are two slots on either part of the device to hold templates. The mirror swings back and forth beneath the stand to ensure a...