Abstract: Copier apparatus is for use with a machine that prepares a copy from an original or master placed atop a surface through which the master is exposed. Defined in the master is a window through which a card placed over the window is exposed along with other matter carried upon the surface of the master. An assembly disposed above the master includes means for accepting a stack of cards which individually carry respective different notations to be exposed through the window. Handling means within the assembly places successive different ones of the cards in a position over the window and correspondingly moves successive ones of those cards from that position into a storage location.