and technology throughout his career, especially emerging fields like television and sound film, and Einstein's work on relativity (which Hausmann rejected). In 1929, he received a patent for a "device for monitoring body cavities and tubes," which today we would call an endoscope (patent number DRP473166). While researching light and electronics for his artworks, Hausmann collaborated with a Russian engineer Daniel Broido to design a computer that used similar technology. The device was granted a patent by the British patent office in 1934 (patent number GB446338). Documentary and Artistic Estate Berlinische Galerie In addition to the documentary partial estate, the collection of the Berlinische Galerie in Berlin (Germany) also includes works of art by Hausmann. In addition to early paintings, these include around 60 works on paper from the years 1911 to 1930 as well as over 350 photographic works. The documentary part of the estate was acquired by the museum in 1992 and focuses on evidence of Raoul Hausmann's life and activities in Berlin up to his emigration in 1933, as well as correspondence with his wife Elfriede and his daughter Vera Hausmann up to Raoul Hausmann's death. In addition to biographical documents, the partial estate consists largely of correspondence. These document, among other things, Hausmann's intellectual exchange with contemporaries, including Johannes Baader, Adolf Behne, César Domela-Nieuwenhuis, Otto Freundlich, Werner Gräff, Franz Jung, Ludwig Mies van der Rohe, László Moholy-Nagy, Hans Richter, Franz Roh, Kurt Schwitters, Arthur Segal and Franz Wilhelm Seifert. Typewritten business correspondence has been preserved as carbon copies and reply letters. In addition, manuscripts and texts by Hausmann (and third parties) on art, culture and philosophy, as well as technical and scientific studies, have survived in the partial estate. The focus of the literary texts is the novel manuscript Hyle, whose stages of development are documented by manuscripts and typescripts. In 2019, the Hausmann collection was expanded through a donation by the German universal artist Timm Ulrichs (*1940). The documentary collection comprises Ulrichs' correspondence with Hausmann from 1967 to 1970, enriched with drafts of Hausmann's texts. Musée d’Art Contemporain de la Haute Vienne Rochechouart The Musée Départemental d'Art Contemporain[fr] at Rochechouart Castle in France holds the second part of Raoul Hausmann's documentary estate. In 1993, the museum acquired the largest part of Hausmann's correspondence from the 1940s until his death in 1971, around 6,000 letters. In 1995, this part of the documentary estate came to the