Fotómetro
Desconocido
View the embedded image gallery online at:
https://www.photomuseum.es/index.php/eu/component/k2/item/745-fotometro-de-selenio#sigProId48c8389fd7
https://www.photomuseum.es/index.php/eu/component/k2/item/745-fotometro-de-selenio#sigProId48c8389fd7