Restefond is with 2715 m. the highest pass in France. The construction of the works at these altitudes was during a large part of the year impossible because of the cold weather. That's why many works were never finished. However a large part of their equipment had already been delivered when the construction works stopped. Here you can see two collectors for the empty cases for the 75 mm guns model 1932 of block 5 of the work Restefond.