Mechanicians

noun

1. One skilled in the theory or construction of machines.

   "The Cotton-Gin is a machine to separate the seeds from cotton, invented by that celebrated mechanician, E. Whitney. -- from the 1828 Webster's Dictionary."

2. One skilled in building, using, or repairing machines, or who makes machines or tools.
3. One skilled in mechanics.
4. A machinist.
5. A scientifically trained practitioner.