see <#ecom=E-COM>.

1.) a device that employs a beam of light to facilitate more accurate <#perf=perforation> of stamps during the manufacturing process.  2.) the markings (see <#eedash=Electric Eye Dashes>,  <#eemargin=Electric Eye Margin Line>,  <#eegutter=Electric Eye Gutter Bar>, and <#eeframe=Electric Eye Frame Bars>) in the <#margin=margins> and <#gutter=gutters> of sheets of stamps that enable the electric eye device to accomplish its purpose of more accurately perforating stamps.  Stamps with electric eye markings were first sold in 1935.

vertical dashes in the vertical <#gutter> between the right and left <#pane=panes> that were used by the <#eleceye=electric eye> in the <#perf=perforating> process.  First used experimentally in 1933.

horizontal lines in the <#sheet> margin used by the <#eleceye=electric eye> in the <#perf=perforating> process.  This marking was first used in 1939.

horizontal line in the right <#margin> of a <#sheet> at the end of the horizontal sheet <#gutter> that was used by the <#eleceye=electric eye> in the <#perf=perforating> process.  First used experimentally in 1933.