<#perf=perforating> accomplished with a straight up and down action of the perforating pins.

a device that applied initials, date, and <#precancel> simultaneously.

the layout of a <#plate>; that is, the relationship of the elements on a plate, especially of the <#pane=panes>, to each other.

a number assigned by the <#scott=Scott Catalogue> to all <#stamp=stamps> with a common <#design>.

a perforating device that is an independent machine; not an integral portion of a printing press.