a perforating device included in the mechanized portion of a printing press, automatically activated as the printed <#web> or <#sheet=sheets> pass through the station.

term used by the <#usps=United States Postal Service> for stamps intended for use on mail.

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

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

a plate with pins that perforates a complete <#sheet> or <#pane> of <#stamp=stamps> with a single stroke.  Its name comes from its resemblance to the farming implement of the same name.