Probably the hammer or something close to it
Isn't it built by some kind of tool??
The first gear-cutting mechanism was designed by Leonardo da Vinci. However, no evidence indicates that it was ever built.
Thesaurus
The first stone age tool was a stick
first-letter study tool is: acronym
the first plane was built in 1903 the first helicopter was built in 1909
where was the first submarine built
The USA built the first nuke.
the first yacht was built in 1245
The first maserati was built in bologna
Adam built the kabah first
spelling checker