"IBM called their cartridge 3480 and DEC originally called theirs CompacTape, but later it was renamed DLT and sold to Quantum."  
 Excuse me, this is ambiguous. Which "it" was renamed and sold, DEC's or IBM's? Or were they the same thing? Were their specs different? Did they co-operate on the format? Can you put a link to the hacker's dictionary definition for 'squaretape'?