What is this tool thread?

How about these Miller Special Tools?

I have a 5 gallon bucket full of tools that i haven't got any clew what they are used on, used for.
Back in the earlier 1980's i would purchase "lot" sales of tools from a vendor on ebay, named Moline stud, from Illinois.

MILLER TOOLS
C-4046
MD998915A
L-4436

Thinking townsend might have info on these three also.