So far they only appeared in Cluck of the Dark Side.
List of Artifacts
Three artifacts are required to build the Humanity's Greatest Fan.
Blade of Revolution
It's consisting of three circles with blades in them. It lets the fan work.
It is located within Epsilon Thalassus (Chapter 4), and it is guarded by the Jellyfish King.
Source of Power
It's a potato battery, which works as the fan's source of power.
It is located within Gamma Chthon (Chapter 6), and it is guarded by the Heart of Darkness.
Thingamajig of Vagueness
It's a button which lets you turn the fan on and off, which has its long and weird name due to the Artifact Naming Department being closed on that day.
It is located within Eta Astropelecae (Chapter 8), and it is guarded by the Ice Golem.