Visor estereoscópico
Breveté
View the embedded image gallery online at:
http://www.photomuseum.es/index.php/es/component/k2/item/609-brevete-stereoscope#sigProIdd6fbb89603
http://www.photomuseum.es/index.php/es/component/k2/item/609-brevete-stereoscope#sigProIdd6fbb89603