Combined relief and intaglio printing method and machine
ES310164A1
Improvements in the procedures and in their corresponding impression machines in sweet engraving and in the printed supports obtained. (Machine-translation by Google Translate, not legally binding)
GB501836A
Improvements in or relating to processes for engraving metals
GB446793A
Improvements in or relating to processes for producing intaglio printing surfaces
DE679802C
Process for the production of intaglio printing forms, preferably of intaglio printing rollers
GB450528A
Improvements in and relating to methods and means for the control of one movable member in respect of other movable members
DE602304C
Form protected against the possibility of forgery for checks, receipts and other fiduciary purposes
