Bookcase with shelves in plexiglas - 1970s

Bookcase with shelves from the 1970s. Consisting out of 4 aluminum posts fixed to the wall and resting on the floor on adjustable feet. There are 16 shelves in smoked plexiglass. The half-modules can be placed at the desired height, in shelves or in pairs to form lockers. The assembly is in good condition, some half modules have slight user marks.