Benz Patent Motor Car: The First Automobile, 1885-1886
The account of Bertha Benz’s 1888 drive comes from here: two teenage sons, fuel bought at a chemist and a blocked line cleared with a hatpin. The hatpin is real.
Cited in
Mercedes-Benz Group. 'Benz Patent Motor Car: The First Automobile, 1885-1886.' Company History. (Bertha Benz's August 1888 Mannheim to Pforzheim drive with Eugen, fifteen, and Richard, fourteen; the ligroin from the Wiesloch pharmacy; the hatpin.)