Source google image: http://idata.over-blog.com/1/12/65/32/GRAND-BALLON–MARKSTEIN/Tete-des-Russiers–ou-Steinkopf–Drumont.JPG
Panneau solaire markstein
Source google image: http://idata.over-blog.com/1/12/65/32/GRAND-BALLON–MARKSTEIN/Tete-des-Russiers–ou-Steinkopf–Drumont.JPG