Which country invented the automatic train coupler?

1868, Yili Hamilton Janne, an American inventor, invented the automatic coupler according to the principle of human handshaking and obtained the patent right. Later, Jenner made a batch of automatic couplers for Amtrak to try out. According to the trial results fed back by users, an improved automatic coupler was developed in 1873, and the patent was applied for the second time. (In 1872, the coupler height standard determined by American railway authorities is 838.2mm, and in 1893, the coupler height standard is limited to 800.2mm-876.3mm).