Remarkable retrophotograph by Ulrich Eumann, an expert in the work of Hans Gutmann, better known in Spanish as Juan Guzmán. It shows several tiznaos (the name for vehicles armoured with steel plates) in Plaça Catalunya on 20 July 1936 combined with the square today complete with a Bus Turístic. It is amazing that within one of day of the coup the anarchist workers set to welding these plates on trucks and luxury Hispano-Suizos. More here in German