Vintage teaching materials from the mid-20th century

Two geometric bodies/shapes from the "Österreichische Lehrmittelanstalt Wien"; vintage teaching materials from the mid-20th century. A sphere and a triangular prism, made of solid wood and painted gray. The sphere can be divided into two halves. These models were used for educational purposes in universities and schools. Age-appropriate signs of use (see photos). Dimensions: Sphere approx. 10 cm ⌀ / Prism approx. 10 x 15 cm.