The mystery of the STRADDLEPRINT aka Axiom ParallAx CD printer interface

Now what the heck is going on here? I needed to hook up a printer to my Commodore 64, and as luck would have it, there was an interface among my stuff. It's a STRADDLEPRINT Interface with Graphics - but I had no manual for it, and didn't know how to configure it, etc. Google has nada for it. Digging through my manuals, I came across a bad photocopy of the manual for an Axiom ParallAx CD interface for Commodore. I thought maybe, just maybe, it might have some clues for me. So I start going over it.. and my luck, it seems to describe what I have rather well.. rather TOO well, in fact. As the similarities piled up, I finally opened the Straddle case and.. the board is marked "ParallAx CD ver. XX". So once again, what the heck is going on, here? Was Straddle actually Axiom / Parallax - or perhaps vice-versa?