The phrase "as first employed" is correct and usable in written English.
It can be used to refer to the initial use or application of a term, concept, or method in a specific context.
Example: "The theory was groundbreaking, as first employed by the researcher in 1995."
Alternatives: "as initially used" or "as originally applied".
Fonda's cowboy returns home to regain the love of his wife, who at first employs him only as a worker on her farm.
Herold still constructs his figures out of the same raw wooden planks as he first employed in his early work.
In 1842 ether was first employed as an anesthetic during surgery, and chloroform followed soon after in 1847.
It was first employed (as humanismus) by 19th-century German scholars to designate the Renaissance emphasis on Classical studies in education.
Solvothermally reduced graphene oxide (STRG) that was synthesized using N-methyl-2-pyrrolidone (NMP) solvent was first employed as an conducting additive up to 15 wt% to commercial graphite anodic material.
This study reports on the synthesis of bimetallic PtAu nanoparticles (NPs) on the transparent conducting oxide electrode by using dry plasma reduction under atmospheric pressure without using any toxic chemicals and at a low temperature, which are first employed as counter electrodes (CEs) for efficient dye-sensitized solar cells (DSCs).
Halliday received a general education in Ohio and was first employed as a printer.
Only later did I put it together that Alderson was where Mrs. Shriver was first employed as a social worker.
They were first employed as service tunnels, then Prohibition happened and they were used to transfer liquor to speakeasies like King Eddy Saloon.
The budget clearly prioritizes the interests of the wealthy, revealing it to be the latest rendition of the conservative supply-side, or "trickle-down," economic ideology first employed as a cornerstone of American economic policy by Ronald Reagan, under whose administration income inequality skyrocketed.
