21. The contact printing process has the advantage that no large-field optical system is required. 22. He typically used sepia platinotype and gum bichromate printing processes . 23. The name Poligraf has many possible meanings, including a printing process used for calendars. 24. The magazine proper began when Usborne learned of a new printing process , Punch ". 25. The printing process was revolutionary, but the girl was spectacular, 26. In 1834, Federico Lacelli patented a zincographic printing process , producing large maps called g�oramas. 27. Otherwise first-class publications were badly served by the printing process . 28. The dye-sublimation printing process is used to print on polyester or other synthetic fabrics. 29. This later provided the basis for the important carbon printing process and related technologies. 30. Three denominations of 1, 2 and 3-cents were printed by the offset printing process .
