A stencil making device capable of controlling numbers of perforations formed by a thermal head. A perforated image is formed by the thermal head in a heat sensitive stencil sheet. An ink in an ink pad passes through the perforated image for providing an inked image on a print sheet. If perforations...http://www.google.fr/patents/US5251567?utm_source=gb-gplus-shareBrevet US5251567 - Stencil making device having means for controlling dot perforation density
Stencil making device having means for controlling dot perforation density
