The Hurricane "Comet" seen here for a rollergun. http://www.skindivinghistory.com/gea...ing-rol02.html
Ted Egan's cable rollergun, I have no photo of it, although it still exists, but is now broken. As for sliding pulleys I have no knowledge of which was first, demultiplying the band drive was not considered a good idea as it weakens the shot, unless you increase the bands.
Always admired your guns and I'm a keen follower of your blog. You should post it in your contact information or leave it as a signature. Love your work!