When will the first CNC engraving machine invented

The net friend to ask: I want to know the history of the CNC engraving machine, when the first invented? Yifan reply: hello. This is the last century, in 1938 the world's first manual engraving machine in France, more than a decade after invented the first real sense of CNC engraving machine, and until the 90 s, due to the explosive development of microelectronics technology, CNC engraving machine is by leaps and bounds.