Ducmarc,
Your topic caught my eye and I looked it up on the Internet and did a bit of reading.
In addition to the history of the rising bite, I learned that it was complex and expensive to build and was eventually replaced by the Dolls Head which was also used on Parker shotguns and other double guns and rifles. Good to know, as you can now skip over the rising bite right on to the Dolls Head!
No moving parts in the DH.