<P> (CF / CFX 01 - 80) </P> <P> AC also produced the AC 428 Frua on a stretched Cobra 427 MK III coil spring chassis . The steel body was designed and built by Pietro Frua until 1973 . </P> <P> (EF / EFX 501--508) </P> <P> The American Electric Car Company used an even further modified chassis for their vehicles . </P>

What does the ac in ac cobra mean