OK. There's obviously a lot of past history here. I think I had the same confusion as RogueOne, in that "Research Assistant", and various variants, is also a title used in industrial labs, and not restricted to grad students. In an industrial setting, one could advance from a lab tech to research assistant, either after X yrs of experience and a proven track record, or by getting a further degree part-time. E.g., in one industrial R&D lab I worked at, lead scientists and engineers, with a few exceptions, all had PhDs. Support personnel were classified as:
LA (HS): lab assistant
TA (2 yr associate): technical assistant
STA (4 yr bachelor): senior technical assistant.
At some point, HR decided "assistant" was not politically correct and changed it to "associate". Other labs use "research" instead of "technical".