Rescue PDF History?

I just found 2 Extrasport rescue vests labeled “Ranger Prototype” at a garage sale. I own modern versions of both the Swiftwater Ranger, and the Universal Rescuer. Who designed them, and when? What is the history of the development of the rescue vest?

Yipes, Mike, that’s a tall order. You
might also try posting on the main boards of and

rescue vest
Thanx, I just hoped that someone would know something.