FFF-09 "Rock And Stone And OIl" (Mining/Extracting Supply)
Miners, MK1 Smelters, Refineries, and Extractors. Small package that only needs four components to make everything.
Part of the "Fetchingly Fast Furnishment for Blueprint Barons" post and collection. Basic idea is to have a factory that not only makes the things at a good clip, but refills the ILS with replacements super fast to cut down on the wait time when you're slamming down blueprints left and right.