 In 1903, a German inventor, Albert Hanson, described flat foil conductors laminated to an insulating board, in multiple layers.Thomas Edison experimented with chemical methods of plating conductors onto linen paper in 1904.Arthur Berry in 1913 patented a print-and-etch method in the UK, and in the United States Max Schoop obtained a patent to flame-spray metal onto a board through a patterned mask.