This article covers the Canon version of this subject.  Click here for Wookieepedia's article on the Legends version of this subject. 

OnACanonArticleGoToLegends

The I-C2 Civil-Industrial Droid was a massive model of construction droid utilized by civilians. It contained a powerful fabrication system that was capable of producing slabs of building materials. The I-C4a combat construction droid was a smaller and militarized version of the I-C2 Civil-Industrial Droid that was manufactured by Veril Line Systems for the Galactic Empire's Imperial Corps of Engineers.[1]

Sources

Notes and references