Visor estereoscópico
Breveté
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http://www.photomuseum.es/index.php/es/component/k2/item/633-brevete-stereoscope-lestrade-simple#sigProIdfbc8e91f72
http://www.photomuseum.es/index.php/es/component/k2/item/633-brevete-stereoscope-lestrade-simple#sigProIdfbc8e91f72