Before revision: It was not until 1839 in Vienna that Slovak cartographer Franz Raffelsperger (1793–1861), having prefected his own printing methods without knowing the work of his predecessors, produced a typometric postal card of the Austrian Empire of unprecedented quality.
After revision: It was not until 1839 in Vienna that the Austrian geographer Franz Raffelsperger (1793–1861), having prefected his own printing methods without knowing the work of his predecessors, produced a typometric postal card of the Austrian Empire of unprecedented quality.