Printed circuit board
Printed circuit boards came from electrical connection systems that were used in the 1850s. Originally metal strips or rods were used to connect large electric components mounted on wooden bases. Later, the metal strips were replaced by wires connected to screw terminals, and wooden bases were replaced by metal frames. This let things be smaller, which was needed as circuits became more complex with more parts. Thomas Edison tested methods of using metals on linen paper.  Arthur Berry in 1913 patented a print-and-etch method in Britain.  In 1925, Charles Ducas of the United States developed a method using electroplating. He created an electrical path directly on an insulated surface by printing through a stencil (a shape cut into a board or paper) with special ink that could conduct electricity, just like wires could. This method was called "printed wiring" or "printed circuit."