Mechanical system and Production line

Mechanical system noun - A system of elements that interact on mechanical principles.

Production line and mechanical system are semantically related. In some cases you can replace phrase "Production line" with "Mechanical system", this phrases are similar.

Production line noun - Mechanical system in a factory whereby an article is conveyed through sites at which successive operations are performed on it.

Mechanical system and production line are semantically related. You can use "Mechanical system" instead a noun phrase "Production line".