Visor estereoscópico
Underwood & Underwood
1901
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https://photomuseum.es/index.php/fr/component/k2/item/770-underwood/-visor-estereoscopico#sigProIda997529c6a
https://photomuseum.es/index.php/fr/component/k2/item/770-underwood/-visor-estereoscopico#sigProIda997529c6a