millwright

noun3

1. •
   Either of two related occupations (as follows); the person who holds it.
2. •
   A tradesperson engaged in the erection of machinery.

   • Thus one dear old character in the millwright's shop would do anything for a pupil or premium, who was prepared to disuss fly-fishing. — 1944
3. •
   (historical) A craftsman who designs, erects, and builds mills and milling machinery.