What is "perfecting press"

Perfect \Per"fect\, v. t. [imp. & p. p. Perfected; p. pr. & vb. n. Perfecting.] [L. perfectus, p. p. of perficere. See Perfect,

1. ] To make perfect; to finish or complete, so as to leave nothing wanting; to give to anything all that is requisite to its nature and kind.

   God dwelleth in us, and his love is perfect in us.
   --1 John iv. 12.

   Inquire into the nature and properties of the things, . . . and thereby perfect our ideas of their distinct species.
   --Locke.

   Perfecting press (Print.), a press in which the printing on both sides of the paper is completed in one passage through the machine.

   Syn: To finish; accomplish; complete; consummate.