Heynlin brought Swiss workmen to install this press in the buildings of the Sorbonne at the end of 1469 or the beginning of 1470: Ulrich Gering (or Guerinch or Guernich) (1445-1510), Michael Friburger and Martin Crantz (or Krantz). Ulrich Gering may have come from Münster in the canton of Aargau, Friburger from Colmar and Crantz may have also come from Münster or Strasbourg. Heynlin gave valuable pecuniary aid to their undertakings, especially for the printing of the works of the Church Fathers. King Louis XI granted letters of naturalization to all three workmen in 1475.