A folding No. 4 Diascope by L. A. Dubernet for Autochrome vertical photographs; image credit on full record.
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Viewer; Diascope, Dubernet, No 4 Vertical, Folding Type.
A Dubernet (folding) No. 4 Diascope patented Sept. 1, 1908 and made by L. A. Dubernet. Designed to accommodate an Autochrome measuring approximately 3.5" by 5" in the vertical or portrait position.
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