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Keywords from Image Description:
Folding stereoscope . Folding handheld lenticular stereoscope David Brewster constr Das Buch der Erfindungen Gewerbe und Industrien Band Aufl Verlagsbuchhandlung Otto Spamer Lepzig Berlin scanned by Koperczak dyskusja lut CET pl Author NOTE This is actually Smith Beck Beck stereoscope and is not connected to Brewster It