Machine and Human collaboration

While it may be said it cannot be made by machine, 

a machine may be necessary eventually. 

For example, gear. 

In order to make a high-accurate mechanical movement, 

you need to refine the gear to polish thoroughly. 

To increase the processing accuracy thoroughly 

by mechanical engineering evolved in the modern part, 

it is polished carefully one by one by the hand of craftsman. 

An advanced technology and a traditional craftsmanship. 

Unless the both get together, 9S mechanical movement can not be made.