Heinrich Lanz OHG, Mannheim A

Heinrich Lanz, Germany's largest agricultural machinery maker since the 1890s, pursued the idea of self-propelled work machines until his death in 1905. In 1907, the firm Heinrich Lanz OHG in Mannheim realised this plan and began series production of traction locomobiles. The Type SZE in the Type A design was a deliberately simple construction: a towed locomobile from the existing Lanz range, fitted with a chain drive to the rear wheels that let it move itself between work sites. The SZE was built from 1907 to 1912. It marks Lanz's transition from stationary steam engines to self-propelled drives, out of which the famous Bulldog tractors later emerged.

Sources: Traktorenlexikon (Wikibooks) – Lanz Typ SZE, Wikipedia – Heinrich Lanz AG