Not sure how the Bentley Patent guns and the Fukert differ in your definitions, but will eagerly await you next and future posts . All of your published work is very good and interesting.

Maybe the Lefever Sidecocker and the Grey patent exterior hammerless guns are part of some of the story. I see the Grey Patent and the American Arms [Semi-hammerless] working on the same idea.

http://www.bakercollectors.com/