4 ms·I would venture to say none. UNIX was completed in 1969, and C itself didn't exist until 1972.by theli0nheart 17y agoI would venture to say none. UNIX was completed in 1969, and C itself didn't exist until 1972.triode 17y agoThere weren't revision control systems as such, but there were a few operating systems which featured versioned filesystems, e.g. ITS and TENEX/TOPS-20.DrJokepu 17y agoSCCS (Source Code Control System) was developed at Bell Labs in 1972.