Antique Oak Bookcase – unusual accordion sliding doors

This is a very unusual Oak bookcase with the unique accordion sliding doors. (note the hinges and how these doors are made to work) When open you slide the doors back and forth.The shelves are adjustable. Measures 54 1/4′ high is 34 1/2″ wide by 13″ deep. The two sectionals on the inside measure 10 1/2″ deep and are 20 1/4″ high. Circa 1900.