Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Publication of BE394072ApublicationCriticalpatent/BE394072A/xx
B61J3/00—Shunting or short-distance haulage devices; Similar devices for hauling trains on steep gradients or as starting aids; Car propelling devices therefor
B61J3/12—Self-propelled tractors or pushing vehicles, e.g. mules
