What is "copying press"

Copying \Cop"y*ing\, a. & n. From Copy, v.

Copying ink. See under Ink.

Copying paper, thin unsized paper used for taking copies of letters, etc., in a copying press.

Copying press, a machine for taking by pressure, an exact copy of letters, etc., written in copying ink.

n. (context historical English) A machine for taking an exact copy, by pressure, of a document written in special ink on special paper.