This vintage wall unit by Kai Kristiansen consists out of:
•3 grey metal brackets; Lenght: 95 cm.
•4 shelves 85 x 23.5 cm (WxD)
•1 wide shelf 85 x 31.5 cm (WxD)
•1 cabinet 85 x 31.5 x35.5 cm (WxDxH).
About the the designer Kai Kristiansen:

In the rank of great Danish designers, Finn Juhl is mentioned in the same breath with Hans J. Wegner and Arne Jacobsen. He became particularly well known for his sculptural, seemingly organic tables, chairs, and sofas. However, the complex interior designs he developed in the forties and fifties were also enormously successful
Danish designer Kai Kristiansen was born in 1929. Like many of Denmark's design greats, he apprenticed in cabinetmaking before enrolling, around 1948, in the prestigious Royal Danish Academy of Fine Arts in Copenhagen under the highly influential designer Kaare Klint. At the age of 26, Kristiansen opened his own studio and began to create furniture in what would soon became known as the Danish modern style. His designs would be produced by well-known Danish manufacturers, such as Feldballes Møbelfabrik, Fornem Møbelkunst, Fritz Hansen, and Magnus Olesen.
His modular FM Reolsystem Wall Unit (1957) for Feldballe Møbelfabrik met with success, not only in Scandinavia, but also throughout the rest of Europe and overseas in the United States.
Because they were so difficult to manufacture, many of Kristiansen’s designs eventually went out of production.
About the manufacturer S.B. Feldballes Møbelfabrik.

Located in Aarhus, Denmark, S.B Feldballes Møbelfabrik specialized in the production of wooden furniture, storage , and display items. Although the circumstances surrounding the company’s inception is unknown, the surviving work has been rediscovered in the 21st century by those who appreciate the classic Danish modern style that Feldballes pieces illustrates.
During the '50s and ‘60s, the renowned Danish designer Kai Kristiansen designed for Feldballes. Known as a major proponent for the Danish modern style, Kristiansen favored well-joined teak and rosewood in many of his designs for Feldballes, which included desks, sideboards, chairs, and wall units . His most successful design was the FM Reolsystem Wall Unit. This modular shelving unit, which came in a variety of add-on shapes and sizes, realized great success, not only in Scandinavia, but throughout the rest of Europe and in the United States.