Secret Printing Experiments
c. 1436-1439
In Strasbourg, Gutenberg formed a partnership with Andreas Dritzehn, Andreas Heilmann, and later, Imanuel, to develop a secret process of printing. Evidence from lawsuits and accounts from this period confirm their work involved a press, metal type and other processes used in printing. Unfortunately records do not explicitly state that printing books was part of the activity, only “arts and adventure”. This was the foundational stage for his movable type printing press, setting the stage for the printing revolution.