Strafor industrial metal shelf 1930s

Rare Strafor shelf circa 1930 from the Strasbourg municipal library. Completely removable, this shelf has a clever system of racks for adjusting the shelves. This shelf from Strafor (Strasbourg) was designed by Robert Lipman at the end of the 19th century. Materials: khaki-colored iron, object entirely preserved in its own juice, traces of original paint use and very superficial rust... The depth of the shelves varies between 20 and 30 cm.