Backdropsource's Yellow Shade Wrinkle-Resistant Background offers a different shades of yellow finish that doesn't fade even under direct lights and high exposures. This background is ideal for home studios, kid portraits & head shots. Backdrop is made from a quality yet lightweight polyester matte material.
Wrinkle-resistant, polyester material
Sewn-in rod pocket at top for hanging
Machine washable with mild detergent, tumble dry on low
Easily release wrinkles with a warm iron on the back or steam while hanging
1 x Wrinkle-Resistant Background
2. Història de la informatica
1º Calcular ----> Abac 3000 aC
2º Primera calculadora mecànica ---->
Pascal(Pascalina) 1642 Sumes I restes
3º Màquina universal ----> Leibnitz (+,-, :
i X)
3. Història de la informàtica (II)
4º Màquina diferencial ----> Babbage (unitat
processament, memòria …) 1832
5º Cens. Poblacio ----> Hans hollerith1889
(targeta perforada)
6º Resolució d'equacions lineals ----> Mark 1
1939 (colossus)