Hangerless Bolts at Bridge

I've always wondered what the deal is with the hangerless bolts between Easily Flakey and Englishman's Crack. Does anyone know?

Do you own the guidebook? Both of the routes between easily flakey and englishman's crack are in there. I think they are called gym-somethingorother and are no star 12/13 sport routes.

Strange, I looked in my guidebook and a random climber's and neither had those routes. Thanks though.