Overburden excavator with conveyer belt.
Overburden Excavator modelled on a prototype of the Krupp company, Book with models, belonging to a steel erector set of the company Stabil, ca. 1930, unknown artist; source: http://home.arcor.de/stabil_baukasten_modelle/walther/stabil/peri4/peri4.html. With the kind permission of the inheritors of Walther & Co.