work-horse perforator at the <#bep=BEP> for definitive sheet <#stamp=stamps> during the late 1980s and beyond. Introduced in February 1985, this machine uses a Eureka <#bullseyeperforations=bullseye perforation> die to perforate two adjoining <#pane=panes> across a printed <#web> at a time. It also separated the web into <#sheet=sheets> four panes square then stacked them.