Hamann Manus R manual calculating machine with automatic division, serial no. 42478, by DeTeWe Communications GmbH, Berlin, Germany, 1953-1955 Hamann Manus R manual calculating machine with automatic division, serial no. 42478 Mathematics 1953-1955

Addimult, Sumax-E stylus operated adding and subtracting device. 'Addimult', Sumax-E stylus operated adding and subtracting device Mathematics 1955-1965

Plaster model to illustrate the torsion of a rectangular prism. Plaster model to illustrate the torsion of a rectangular prism Mathematics 1876